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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2017 shares
Document and Entity Information
Entity Registrant Name	CTRIP COM INTERNATIONAL LTD
Entity Central Index Key	0001269238
Document Type	20-F
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	67,600,654
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY

CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS)	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares	Dec. 31, 2015 CNY (¥) ¥ / shares shares
Revenues:
Accommodation reservation	$ 1,462,793,652	¥ 9,517,374,339	¥ 7,308,958,863	¥ 4,616,649,394
Transportation ticketing	1,878,337,918	12,221,029,997	8,826,516,571	4,453,885,749
Packaged-tour	456,539,574	2,970,383,429	2,310,198,894	1,667,945,350
Corporate travel	115,767,626	753,218,904	608,122,125	473,245,440
Others	232,847,977	1,514,978,795	734,290,185	285,220,475
Total revenues	4,146,286,747	26,976,985,464	19,788,086,638	11,496,946,408
Less: Sales tax and surcharges	(30,332,823)	(197,354,446)	(559,646,824)	(599,378,347)
Net revenues	4,115,953,924	26,779,631,018	19,228,439,814	10,897,568,061
Cost of revenues	(719,027,574)	(4,678,209,103)	(4,729,750,192)	(3,043,439,819)
Gross profit	3,396,926,350	22,101,421,915	14,498,689,622	7,854,128,242
Operating expenses:
Product development	(1,269,420,793)	(8,259,232,508)	(7,687,421,506)	(3,296,692,936)
Sales and marketing	(1,274,793,121)	(8,294,186,482)	(5,860,927,432)	(3,087,989,953)
General and administrative	(402,968,259)	(2,621,832,381)	(2,518,819,170)	(1,088,402,408)
Total operating expenses	(2,947,182,173)	(19,175,251,371)	(16,067,168,108)	(7,473,085,297)
Income/(loss) from operations	449,744,177	2,926,170,544	(1,568,478,486)	381,042,945
Interest income	151,792,880	987,610,015	567,144,610	445,767,036
Interest expense	(197,698,232)	(1,286,284,010)	(731,922,838)	(302,425,829)
Other income /(expense)	135,099,540	878,998,137	(26,848,287)	2,480,979,830
Income/(loss) before income tax expense, equity in income of affiliates and non-controlling interests	538,938,365	3,506,494,686	(1,760,105,001)	3,005,363,982
Income tax expense	(196,812,834)	(1,280,523,340)	(478,009,033)	(470,188,423)
Equity in income / (loss) of affiliates	(10,008,156)	(65,116,066)	601,883,179	(135,780,312)
Net income/(loss)	332,117,375	2,160,855,280	(1,636,230,855)	2,399,395,247
Net loss/(income) attributable to non-controlling interests	(2,896,230)	(18,843,743)	205,527,660	108,260,637
Net income/(loss) attributable to Ctrip.com International, Ltd.	329,221,145	2,142,011,537	(1,430,703,195)	2,507,655,884
Net income/(loss)	332,117,375	2,160,855,280	(1,636,230,855)	2,399,395,247
Other comprehensive income:
Foreign currency translation	111,173,828	723,330,274	(323,581,599)	(489,917,917)
Unrealized securities holding gains, net of tax	720,154,951	4,685,544,158	914,529,809	606,415,822
Reclassification adjustment for net gain recognized on disposal of available-for-sale investments	(6,140,402)	(39,951,298)	(140,651,759)
Total comprehensive income/(loss)	1,157,305,752	7,529,778,414	(1,185,934,404)	2,515,893,152
Comprehensive loss/ (income) attributable to non-controlling interests	(2,896,230)	(18,843,743)	205,527,660	108,260,637
Comprehensive income/(loss) attributable to Ctrip.com International, Ltd.	$ 1,154,409,522	¥ 7,510,934,671	¥ (980,406,744)	¥ 2,624,153,789
Weighted average ordinary shares outstanding
- Basic shares (in shares)	66,300,808	66,300,808	59,166,582	37,797,698
- Diluted shares (in shares)	71,775,893	71,775,893	59,166,582	47,375,248
Product development
Share-based compensation included in Operating expense above is as follows:
Share-based compensation	$ 155,656,289	¥ 1,012,746,515	¥ 2,079,514,506	¥ 291,642,931
Sales and marketing
Share-based compensation included in Operating expense above is as follows:
Share-based compensation	28,554,724	185,785,599	392,641,663	65,574,256
General and administrative
Share-based compensation included in Operating expense above is as follows:
Share-based compensation	$ 97,640,747	¥ 635,279,991	¥ 1,087,562,537	¥ 285,379,287
Ordinary shares
Earnings/(loss) per ordinary share/ADS
- Basic (in RMB or dollars per share) \| (per share)	$ 4.97	¥ 32.31	¥ (24.18)	¥ 66.34
- Diluted (in RMB or dollars per share) \| (per share)	4.70	30.57	(24.18)	56.85
ADS
Earnings/(loss) per ordinary share/ADS
- Basic (in RMB or dollars per share) \| (per share)	0.62	4.04	(3.02)	8.29
- Diluted (in RMB or dollars per share) \| (per share)	$ 0.59	¥ 3.82	¥ (3.02)	¥ 7.11

CONSOLIDATED BALANCE SHEETS	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)
Current assets:
Cash and cash equivalents	$ 2,803,896,483	¥ 18,242,991,687	$ 2,833,358,629	¥ 18,434,681,251
Restricted cash	268,785,090	1,748,796,431		1,744,490,307
Short-term investments	4,323,492,324	28,129,938,110		14,112,862,288
Accounts receivable, net	700,713,570	4,559,052,701		4,624,818,322
Due from related parties	57,448,327	373,776,048		787,603,986
Prepayments and other current assets	948,659,787	6,172,265,172		6,206,985,686
Total current assets	9,102,995,581	59,226,820,149		45,911,441,840
Long-term deposits and prepayments	129,093,380	839,920,256		1,147,279,197
Long-term loan receivable	2,920,247	19,000,000		215,673,057
Long-term receivables due from related parties	33,560,296	218,353,359		599,913,241
Land use rights	14,871,949	96,761,364		99,544,772
Property, equipment and software	863,086,613	5,615,500,429		5,591,960,081
Investments	3,930,618,826	25,573,785,268		20,532,822,365
Goodwill	8,644,859,796	56,246,051,292		56,015,185,590
Intangible assets	2,113,384,861	13,750,315,921		13,924,769,931
Deferred tax assets	71,003,377	461,969,275		375,311,594
Total assets	24,906,394,926	162,048,477,313		144,413,901,668
Current liabilities:
Short-term debt and current portion of long-term debt	2,507,766,699	16,316,282,473		6,887,309,589
Accounts payable	1,146,458,548	7,459,203,252		7,278,791,082
Due to related parties	64,322,406	418,500,869		837,421,345
Salary and welfare payable	532,513,421	3,464,692,073		2,508,430,757
Taxes payable	142,548,467	927,463,089		1,084,241,429
Advances from customers	1,209,217,609	7,867,532,529		8,190,840,057
Accrued liability for customer reward program	93,697,131	609,621,643		658,170,680
Other payables and accruals	783,338,681	5,096,636,473		2,849,821,247
Total current liabilities	6,479,862,962	42,159,932,401		30,295,026,186
Deferred tax liabilities	591,340,739	3,847,440,251		3,607,882,808
Long-term Debt	4,491,070,926	29,220,254,767		34,650,673,553
Other long-term Liabilities	53,459,031	347,820,491		339,566,619
Total liabilities	11,615,733,658	75,575,447,910		68,893,149,166
Commitments and contingencies (Note 20)
Shareholders' equity
Share capital (US$0.01 par value; 175,000,000 shares authorized, issued shares as of December 31, 2016 and 2017: 67,402,721 and 70,529,793; outstanding shares as of December 31, 2016 and 2017: 64,155,412 and 67,600,654 )	795,122	5,173,301		4,960,354
Additional paid-in capital	10,964,926,000	71,341,098,032		65,819,998,701
Statutory reserves	58,961,865	383,623,583		237,495,820
Accumulated other comprehensive income	980,479,976	6,379,296,866		1,010,373,732
Retained earnings	1,336,465,025	8,695,442,393		6,699,580,613
Less: Treasury stock (3,247,309 and 2,929,139 shares as of December 31, 2016 and 2017, respectively.)	(324,427,189)	(2,110,820,623)		(2,235,574,510)
Total Ctrip.com International, Ltd. shareholders' equity	13,017,200,799	84,693,813,552		71,536,834,710
Non-controlling interests	273,460,469	1,779,215,851		3,983,917,792
Total shareholders' equity	13,290,661,268	86,473,029,403		75,520,752,502
Total liabilities and shareholders' equity	$ 24,906,394,926	¥ 162,048,477,313		¥ 144,413,901,668

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Shareholders' equity
Share capital, par value (in dollars per share)	$ 0.01	$ 0.01
Share capital, shares authorized	175,000,000	175,000,000
Share capital, shares issued	70,529,793	67,402,721
Share capital, shares outstanding	67,600,654	64,155,412
Treasury stock, shares	2,929,139	3,247,309

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY	Ordinary shares CNY (¥) shares	Additional paid-in capital CNY (¥)	Statutory reserves CNY (¥)	Accumulated other comprehensive income/(loss) CNY (¥)	Retained earnings CNY (¥)	Treasury stock CNY (¥) shares	Total Ctrip.com International, Ltd. shareholders' equity CNY (¥)	Non-controlling interests CNY (¥)	USD ($) shares	CNY (¥) shares
Balance at Dec. 31, 2014	¥ 3,085,272	¥ 4,828,021,816	¥ 134,098,747	¥ 443,579,376	¥ 5,726,024,997	¥ (1,605,630,913)	¥ 9,529,179,295	¥ 848,548,293		¥ 10,377,727,588
Balance (in shares) at Dec. 31, 2014 \| shares	35,146,982					(3,323,262)
Changes in shareholders' equity
Issuance of common stock pursuant to share incentive plan	¥ 48,673	207,980,247					208,028,920			¥ 208,028,920
Issuance of common stock pursuant to share incentive plan (in shares) \| shares	777,846
Issuance of ordinary shares for the exercise of stock options (in shares) \| shares									506,163	506,163
Share-based compensation		642,596,474					642,596,474			¥ 642,596,474
Appropriations to statutory reserves			34,842,222		(34,842,222)
Repurchasing common stock						¥ (872,290,891)	(872,290,891)			(872,290,891)
Repurchasing common stock (in shares) \| shares	(498,561)					(498,561)
Foreign currency translation adjustments				(489,917,917)			(489,917,917)			(489,917,917)
Unrealized securities holding gains				606,415,822			606,415,822			606,415,822
Purchasing of Purchased Call Option		(805,504,000)					(805,504,000)			(805,504,000)
Sale of Issued Warrants		523,404,000					523,404,000			523,404,000
Early Conversion of Convertible Notes		13,979,289				¥ 104,994,432	118,973,721			¥ 118,973,721
Early Conversion of Convertible Notes (in shares) \| shares	244,466					244,466			244,466	244,466
Net income / (loss)					2,507,655,884		2,507,655,884	(108,260,637)		¥ 2,399,395,247
Issuance of additional equity stake by subsidiaries								966,486,957		966,486,957
Disposal of shares in subsidiaries		15,824,133					15,824,133	(747,801,153)		(731,977,020)
Acquisition of additional stake in subsidiaries		(10,078,392)					(10,078,392)	(36,158,510)		(46,236,902)
Business combination	¥ 985,530	32,540,379,845					32,541,365,375	18,211,383,297		50,752,748,672
Business combination (in shares) \| shares	15,468,816
Share issuance for the investments	¥ 1,770	35,075,540					35,077,310			35,077,310
Share issuance for the investments (in shares) \| shares	27,679
Balance at Dec. 31, 2015	¥ 4,121,245	37,991,678,952	168,940,969	560,077,281	8,198,838,659	¥ (2,372,927,372)	44,550,729,734	19,134,198,247		63,684,927,981
Balance (in shares) at Dec. 31, 2015 \| shares	51,167,228					(3,577,357)
Changes in shareholders' equity
Issuance of ordinary shares for the exercise of stock options	¥ 52,744	197,628,625					197,681,369			¥ 197,681,369
Issuance of ordinary shares for the exercise of stock options (in shares) \| shares	796,582								368,722	368,722
Share-based compensation		3,559,718,706					3,559,718,706			¥ 3,559,718,706
Appropriations to statutory reserves			68,554,851		(68,554,851)
Foreign currency translation adjustments				(323,581,599)			(323,581,599)			(323,581,599)
Unrealized securities holding gains				914,529,809			914,529,809			914,529,809
Disposal of available-for-sale investment				(140,651,759)			(140,651,759)			(140,651,759)
Early Conversion of Convertible Notes		29,400,802				¥ 137,352,862	166,753,664			¥ 166,753,664
Early Conversion of Convertible Notes (in shares) \| shares	330,048					330,048			330,048	330,048
Net income / (loss)					(1,430,703,195)		(1,430,703,195)	(205,527,660)		¥ (1,636,230,855)
Issuance of ordinary shares, net of issuance costs	¥ 295,871	10,652,275,264					10,652,571,135			10,652,571,135
Issuance of ordinary shares, net of issuance costs (in shares) \| shares	4,436,844
Issuance of additional equity stake by subsidiaries								135,359,483		135,359,483
Issuance of ordinary shares for early Conversion of Convertible Notes	¥ 67,680	2,438,050,267					2,438,117,947			2,438,117,947
Issuance of ordinary shares for early Conversion of Convertible Notes (in shares) \| shares	1,044,805
Disposal of shares in subsidiaries								(3,289,000)		(3,289,000)
Acquisition of additional stake in subsidiaries	¥ 355,697	8,969,187,969					8,969,543,666	(15,501,696,332)		(6,532,152,666)
Acquisition of additional stake in subsidiaries ( in Shares) \| shares	5,407,787
Business combination	¥ 67,117	1,982,058,116					1,982,125,233	424,873,054		2,406,998,287
Business combination (in shares) \| shares	972,118
Balance at Dec. 31, 2016	¥ 4,960,354	65,819,998,701	237,495,820	1,010,373,732	6,699,580,613	¥ (2,235,574,510)	71,536,834,710	3,983,917,792		75,520,752,502
Balance (in shares) at Dec. 31, 2016 \| shares	64,155,412					(3,247,309)
Changes in shareholders' equity
Issuance of ordinary shares for the exercise of stock options	¥ 111,181	620,507,559					620,618,740			¥ 620,618,740
Issuance of ordinary shares for the exercise of stock options (in shares) \| shares	1,639,073								1,353,697	1,353,697
Share-based compensation		1,833,812,105					1,833,812,105			¥ 1,833,812,105
Appropriations to statutory reserves			146,149,757		(146,149,757)
Foreign currency translation adjustments				723,330,274			723,330,274		$ 111,173,828	723,330,274
Unrealized securities holding gains				4,685,544,158			4,685,544,158		720,154,951	4,685,544,158
Disposal of available-for-sale investment				(39,951,298)			(39,951,298)		$ (6,140,402)	(39,951,298)
Early Termination of Call Option		650,246,133					650,246,133			650,246,133
Early Conversion of Convertible Notes		37,328,056				¥ 124,753,887	162,081,943			¥ 162,081,943
Early Conversion of Convertible Notes (in shares) \| shares	318,170					318,170			318,170	318,170
Net income / (loss)					2,142,011,537		2,142,011,537	18,843,743	$ 332,117,375	¥ 2,160,855,280
Issuance of ordinary shares for early Conversion of Convertible Notes	¥ 71,236	2,233,606,836					2,233,678,072			2,233,678,072
Issuance of ordinary shares for early Conversion of Convertible Notes (in shares) \| shares	1,043,375
Disposal of shares in subsidiaries			(21,994)				(21,994)			(21,994)
Acquisition of additional stake in subsidiaries	¥ 30,530	145,598,642					145,629,172	(2,457,561,946)		(2,311,932,774)
Acquisition of additional stake in subsidiaries ( in Shares) \| shares	444,624
Business combination								234,016,262		234,016,262
Balance at Dec. 31, 2017	¥ 5,173,301	¥ 71,341,098,032	¥ 383,623,583	¥ 6,379,296,866	¥ 8,695,442,393	¥ (2,110,820,623)	¥ 84,693,813,552	¥ 1,779,215,851	$ 13,290,661,268	¥ 86,473,029,403
Balance (in shares) at Dec. 31, 2017 \| shares	67,600,654					(2,929,139)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
Ordinary shares, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01

CONSOLIDATED STATEMENTS OF CASH FLOWS	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Cash flows from operating activities:
Net income/(loss)	$ 332,117,375	¥ 2,160,855,280	¥ (1,636,230,855)	¥ 2,399,395,247
Adjustments to reconcile net income to cash provided by operating activities:
Share-based compensation	281,851,760	1,833,812,105	3,559,718,706	642,596,474
Equity in (income) / loss of affiliates	10,008,156	65,116,066	(601,883,179)	135,780,312
Gain on deconsolidation of subsidiaries			(252,000)	(2,294,451,702)
Loss from disposal of property, equipment and software	8,013,206	52,136,323	8,871,987	33,986,560
Gain on disposal of cost method investment	(211,251,004)	(1,374,462,407)	(149,066,258)
Gain on disposal of available-for-sale investment	(6,140,402)	(39,951,298)	(140,651,759)
Gain on disposal of equity method investment	(343,451)	(2,234,593)
Gain from disposal of a subsidiary	(1,754,052)	(11,412,387)
Impairments of cost method investment	21,405,634	139,271,481	11,628,980
Impairments of available-for-sale investment	41,760,725	271,707,804	36,357,902
Provision/impairment related to an equity method investment	148,685,890	967,395,005
Provision for doubtful accounts	15,053,760	97,944,278	32,339,617	32,080,786
Depreciation of property, equipment and software	75,281,051	489,801,100	461,391,147	255,966,352
Amortization of intangible assets and land use rights	60,464,559	393,400,562	257,444,573	60,247,658
Deferred income tax expenses/(benefits)	(26,420,740)	(171,901,260)	23,475,428	86,464,693
Changes in current assets and liabilities, net of assets acquired and liabilities assumed/disposed of in business combinations/dispositions net of deconsolidations:
Increase in accounts receivable	(5,337,598)	(34,728,011)	(1,332,377,049)	(1,002,531,319)
(Increase)/ Decrease in due from related parties	39,813,478	259,038,434	(601,601,918)	(81,376,345)
(Increase) /Decrease in prepayments and other current assets	62,995,694	409,868,886	591,425,514	(2,224,053,491)
(Increase) /Decrease in long-term receivables	6,890,133	44,829,270	75,371,314	(381,458,105)
Increase in accounts payable	26,296,300	171,091,615	1,251,267,578	2,098,144,678
Increase/(Decrease) in due to related parties	(55,213,369)	(359,234,745)	583,479,889	236,779,810
Increase in salary and welfare payable	146,585,375	953,728,427	1,259,133,720	271,783,211
Increase /(Decrease) in taxes payable	(21,472,394)	(139,705,838)	(778,280,444)	281,472,256
Increase/(Decrease) in advances from customers	(52,345,171)	(340,573,384)	2,270,992,194	2,056,500,006
Increase /(Decrease) in accrued liability for customer reward program	(7,461,850)	(48,549,037)	64,823,864	162,493,908
Increase in other payables and accruals	196,981,013	1,281,617,550	25,351,540	278,988,927
Net cash provided by operating activities	1,086,464,078	7,068,861,226	5,272,730,491	3,048,809,916
Cash flows from investing activities:
Purchase of property, equipment and software	(72,409,888)	(471,120,452)	(682,831,310)	(638,133,430)
Cash paid for long-term investments	(236,839,357)	(1,540,947,911)	(5,408,471,460)	(4,232,366,913)
Cash paid for business combinations, net of cash acquired	(47,429,316)	(308,589,355)	(9,157,391,070)	4,112,960,205
Purchase of intangible assets	(3,545,057)	(23,065,204)	(6,210,651)	(20,000,000)
(Increase) /Decrease in restricted cash	(661,839)	(4,306,124)	525,250,267	(760,873,462)
Increase in short-term investments	(2,141,890,582)	(13,935,782,692)	(5,934,919,483)	(1,447,586,170)
Increase in long-term loan receivable				(872,200,000)
Cash repayment from long-term receivables			212,217,989	872,200,000
Cash received from loans to the users	67,733,984	440,697,616
Cash paid for loans to the users	(89,097,236)	(579,693,345)
Net change in loans to the users	(38,697,364)	(251,776,662)
Cash received from disposal of equity method investments	802,965	5,224,333	17,665,162
Cash received from disposal of cost method investments	222,520,929	1,447,787,923	317,155,061
Cash received from disposal of available-for-sale investments			382,387,499	61,980,000
Cash used from deconsolidation of a subsidiary, net of cash disposed			(90,331,000)	(1,502,561,561)
Cash disposed from disposal of a subsidiary net of cash received	(1,641,477)	(10,679,942)
Net cash used in investing activities	(2,341,154,238)	(15,232,251,815)	(19,825,478,996)	(4,426,581,331)
Cash flows from financing activities:
Proceeds from short-term bank loans	328,478,188	2,137,177,635	1,979,869,005	644,411,544
Proceeds from long-term bank loans	953,157,076	6,201,525,881	2,550,000,000
Proceeds from exercise of share options	112,465,663	731,735,342	211,720,242	52,117,597
Repurchase of ordinary shares				(872,290,891)
Cash paid for acquisition of additional equity stake in subsidiaries	(270,426,886)	(1,759,478,448)	(6,532,152,666)	(46,236,902)
Cash paid for settlement of convertible notes			(2,033,967,447)
Cash received from non-controlling investors	8,892,836	57,859,460	86,609,482	275,972,483
Proceeds from issuance convertible preferred shares by a subsidiary				725,512,513
Proceeds from issuance of senior convertible notes, net of issuance costs			6,544,966,036	14,736,200,000
Proceeds from sale of warrants				523,404,000
Purchase of Purchased Call Option				(805,504,000)
Proceeds from Early Termination of Purchased Call Option	99,941,001	650,246,133
Proceeds from issuance of ordinary shares, net of issuance costs			10,652,571,135
Repayment of loans due to related parties			(1,820,911,519)
Proceeds from repayment of loans due from related parties			651,053,394
Net cash provided by financing activities	1,232,507,878	8,019,066,003	12,289,757,662	15,233,586,344
Effect of foreign exchange rate changes on cash and cash equivalents	(7,279,864)	(47,364,978)	1,481,997,420	58,971,946
Net increase/ (decrease) in cash and cash equivalents	(29,462,146)	(191,689,564)	(780,993,423)	13,914,786,875
Cash and cash equivalents, beginning of year	2,833,358,629	18,434,681,251	19,215,674,674	5,300,887,799
Cash and cash equivalents, end of year	2,803,896,483	18,242,991,687	18,434,681,251	19,215,674,674
Supplemental disclosure of cash flow information
Cash paid during the year for income taxes	242,146,650	1,575,478,750	411,766,790	243,828,898
Cash paid for interest, net of amounts capitalized	187,255,989	1,218,343,638	593,546,761	242,114,200
Supplemental schedule of non-cash investing and financing activities
Conversion of convertible senior notes	368,221,572	2,395,760,015	2,604,871,611	118,973,721
Non-cash consideration paid for business acquisitions, investments and non-controlling interest	(181,238,930)	(1,179,194,851)	(14,625,921,507)	(32,590,874,841)
Share exchange for equity investment (Note 8)			(2,498,763,234)
Accruals related to purchase of property, equipment and software	(6,523,857)	(42,446,173)	(22,855,856)	(48,486,734)
Share issuance for the investments				(35,077,310)
Unpaid cash consideration for business acquisitions and acquisition of additional shares of subsidiary (Note 2)	$ (96,165,607)	¥ (625,682,288)	¥ (497,434,415)	¥ (110,302,844)

ORGANIZATION AND NATURE OF OPERATIONS	12 Months Ended
ORGANIZATION AND NATURE OF OPERATIONS	Dec. 31, 2017
ORGANIZATION AND NATURE OF OPERATIONS
ORGANIZATION AND NATURE OF OPERATIONS	1. ORGANIZATION AND NATURE OF OPERATIONS The accompanying consolidated financial statements include the financial statements of Ctrip.com International, Ltd. (the “Company”), its subsidiaries, VIEs and VIEs’ subsidiaries. The Company, its subsidiaries, the consolidated VIEs and their subsidiaries are collectively referred to as the “Group”. The Group is principally engaged in the provision of travel related services including accommodation reservation, transportation ticketing, packaged-tour, corporate travel management services, as well as, to a much lesser extent, Internet-related advertising and other related services.

PRINCIPAL ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2017

PRINCIPAL ACCOUNTING POLICIES

PRINCIPAL ACCOUNTING POLICIES

2. PRINCIPAL ACCOUNTING POLICIES

Basis of presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”).

The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the balance sheet dates and the reported amounts of revenues and expenses during the reporting periods. Actual results could materially differ from those estimates.

Consolidation

The consolidated financial statements include the financial statements of the Company, its subsidiaries, VIEs and VIEs’ subsidiaries. All significant transactions and balances between the Company, its subsidiaries, VIEs and VIEs’ subsidiaries have been eliminated upon consolidation.

A subsidiary is an entity in which the Company, directly or indirectly, controls more than one half of the voting power; has the power to appoint or remove the majority of the members of the board of directors; to cast a majority of votes at the meeting of the board of directors or to govern the financial and operating policies of the investee under a statute or agreement among the shareholders or equity holders.

The Company applies the guidance codified in Accounting Standard Codification 810, Consolidations (“ASC 810”) on accounting for VIEs and their respective subsidiaries, which requires certain variable interest entities to be consolidated by the primary beneficiary of the entity in which it has a controlling financial interest. A VIE is an entity with one or more of the following characteristics: (a) the total equity investment at risk is not sufficient to permit the entity to finance its activities without additional financial support; (b) as a group, the holders of the equity investment at risk lack the ability to make certain decisions, the obligation to absorb expected losses or the right to receive expected residual returns, or (c) an equity investor has voting rights that are disproportionate to its economic interest and substantially all of the entity’s activities are on behalf of the investor. Accordingly, the financial statements of the following VIEs and VIEs’ subsidiaries are consolidated into the Company’s financial statements since July 1, 2003 or their respective date of establishment/acquisition, whichever is later:

The following is a summary of the Company’s major VIEs and VIEs’ subsidiaries:

Name of VIE and VIEs’ subsidiaries		Date of establishment/acquisition

Shanghai Ctrip Commerce Co., Ltd. (“Shanghai Ctrip Commerce”)		Established on July 18, 2000
Shanghai Huacheng Southwest International Travel Agency Co., Ltd. (“Shanghai Huacheng”, formerly known as Shanghai Huacheng Southwest Travel Agency Co., Ltd.)		Established on March 13, 2001
Chengdu Ctrip Travel Agency Co., Ltd. (“Chengdu Ctrip”)		Established on January 8, 2007
Beijing Qu Na Information Technology Company Limited (“Qunar Beijing”)		Established on March 17, 2006

The Company is considered the primary beneficiary of a VIE or VIEs’ subsidiary and consolidated the VIE or VIEs’ subsidiary if the Company had variable interests, that will absorb the entity’s expected losses, receive the entity’s expected residual returns, or both.

Major variable interest entities and their subsidiaries

The Company conducts a part of its operations through a series of agreements with certain VIEs and VIEs’ subsidiaries as stated in above. These VIEs and VIEs’ subsidiaries are used solely to facilitate the Group’s participation in Internet content provision, advertising business, travel agency and air-ticketing services in the People’s Republic of China (“PRC”) where foreign ownership is restricted. From 2015, the Company restructured its business lines to change some of its VIEs to its wholly owned subsidiaries, which carry out the businesses that are not foreign ownerships restricted.

Shanghai Ctrip Commerce is a domestic company incorporated in Shanghai, the PRC. Shanghai Ctrip Commerce holds a value-added telecommunications business license and is primarily engaged in the provision of advertising business on the Internet website. Two senior officers of the Company collectively hold 100% of the equity interest in Shanghai Ctrip Commerce. The registered capital of Shanghai Ctrip Commerce was RMB30,000,000 as of December 31, 2017.

Shanghai Huacheng is a domestic company incorporated in Shanghai, the PRC. Shanghai Huacheng holds a domestic travel agency license and an air transport sales agency license and mainly provides domestic tour services and air-ticketing services. Shanghai Ctrip Commerce holds 100% of the equity interest in Shanghai Huacheng. The registered capital of Shanghai Huacheng was RMB100,000,000 as of December 31, 2017.

Chengdu Ctrip is a domestic company incorporated in Chengdu, the PRC. Chengdu Ctrip holds air transport sales agency license and domestic travel agency license and is engaged in the provision of air-ticketing service. Two senior officers of the Company holds 100% of the equity interest in Chengdu Ctrip. The registered capital of Chengdu Ctrip was RMB500,000,000 as of December 31, 2017.

Qunar Beijing is a domestic company incorporated in Beijing, the PRC. Qunar Beijing holds various domestic and cross-border business licenses of Qunar. Two senior officers of the Company holds 100% of the equity interest in Qunar Beijing. The registered capital of Qunar Beijing was RMB11,000,000 as of December 31, 2017.

The capital injected by senior officers or senior officer’s family member are funded by the Company and are recorded as long-term business loans to related parties. The Company does not have any ownership interest in these VIEs and VIEs’ subsidiaries.

As of December 31, 2017, the Company has various agreements with its consolidated VIEs and VIEs’ subsidiaries, including loan agreements, exclusive technical consulting and services agreements, share pledge agreements, exclusive option agreements and other operating agreements.

Details of certain key agreements with the VIEs are as follows:

Powers of Attorney: Each of the shareholders of our consolidated affiliated Chinese entities, except for Hui Cao and Hui Wang, signed an irrevocable power of attorney to appoint Ctrip Travel Network and Ctrip Travel Information, as attorney-in-fact to vote, by itself or any other person to be designated at its discretion, on all matters of the applicable consolidated affiliated Chinese entities. Each such power of attorney will remain effective as long as the applicable consolidated affiliated Chinese entity exists, and such shareholders of the applicable consolidated affiliated Chinese entities are not entitled to terminate or amend the terms of the power of attorneys without prior written consent from us.

As of the date of this annual report, each of the shareholders of Qunar Beijing, Hui Cao and Hui Wang, also signed an irrevocable power of attorney authorizing an appointee, to exercise, in a manner approved by Qunar on such shareholder’s behalf the full shareholder rights pursuant to applicable laws and Qunar Beijing’s articles of association, including without limitation full voting rights and the right to sell or transfer any or all of such shareholder’s equity interest in Qunar Beijing. Each such power of attorney is effective until such time as such relevant shareholder ceases to hold any equity interest in Qunar Beijing. The terms of the power of attorney with respect to Qunar Beijing are otherwise substantially similar to the terms described in the foregoing paragraph.

Technical Consulting and Services Agreements: Ctrip Travel Information and Ctrip Travel Network, each a wholly owned PRC subsidiary of ours, provide our consolidated affiliated Chinese entities, except for Qunar Beijing, with technical consulting and related services and staff training and information services on an exclusive basis. We also maintain their network platforms. In consideration for our services, our consolidated affiliated Chinese entities agree to pay us service fees as calculated in such manner as determined by us from time to time based on the nature of service, which may be adjusted periodically. For 2017, our consolidated affiliated Chinese entities paid Ctrip Travel Information a quarterly fee based on the number of transportation tickets sold in the quarter, at an average rate from RMB5 (US$0.8) to RMB8 (US$1.2) per ticket. Although the service fees are typically determined based on the number of transportation tickets sold, given the fact that the nominee shareholders of such consolidated affiliated Chinese entities have irrevocably appointed the employees of our subsidiaries to vote on their behalf on all matters they are entitled to vote on, we have the right to determine the level of service fees paid and therefore receive substantially all of the economic benefits of our consolidated affiliated Chinese entities in the form of service fees. Ctrip Travel Information and Ctrip Travel Network, as appropriate, will exclusively own any intellectual property rights arising from the performance of this agreement. The initial term of these agreements is 10 years and may be renewed automatically in 10-year terms unless we disapprove the extension. We retain the exclusive right to terminate the agreements at any time by delivering a 30-day advance written notice to the applicable consolidated affiliate Chinese entity.

As of the date of this annual report, pursuant to the restated exclusive technical consulting and services agreement between Qunar Beijing and Qunar Software, Qunar Software provides Qunar Beijing with technical, marketing and management consulting services on an exclusive basis in exchange for service fee paid by Qunar Beijing based on a set formula defined in the agreement subject to adjustment by Qunar Software at its sole discretion. This agreement will remain in effect until terminated unilaterally by Qunar Software or mutually. The terms of this agreement are otherwise substantially similar to the terms described in the foregoing paragraph.

Share Pledge Agreements: The shareholders of our consolidated affiliated Chinese entities, except for Hui Cao and Hui Wang, have pledged their respective equity interests in the applicable consolidated affiliated Chinese entities as a guarantee for the performance of all the obligations under the other contractual arrangements, including payment by such consolidated affiliated Chinese entities of the technical and consulting services fees to us under the technical consulting and services agreements, repayment of the business loan under the loan agreements and performance of obligations under the exclusive option agreements, each agreement as described herein. In the event any of such consolidated affiliated Chinese entity breaches any of its obligations or any shareholder of such consolidated affiliated Chinese entities breaches his or her obligations, as the case may be, under these agreements, we are entitled to enforce the equity pledge right and sell or otherwise dispose of the pledged equity interests after the pledge is registered with the relevant local branch of SAIC, and retain the proceeds from such sale or require any of them to transfer his or her equity interest without consideration to the PRC citizen(s) designated by us. These share pledge agreements are effective until two years after the pledgor and the applicable consolidated affiliated Chinese entities no longer undertake any obligations under the above-referenced agreements.

As of the date of this annual report, pursuant to the equity interest pledge agreement among Qunar Software, Hui Cao and Hui Wang, Hui Cao and Hui Wang have pledged their equity interests in Qunar Beijing along with all rights, titles and interests to Qunar Software as guarantee for the performance of all obligations under the relevant contractual arrangements mentioned herein. After the pledge is registered with the relevant local branch of SAIC, Qunar Software may enforce this pledge upon the occurrence of a settlement event or as required by the PRC law. The pledge, along with this agreement, will be effective upon registration with the local branch of the SAIC, and will expire when all obligations under the relevant contractual arrangements have been satisfied or when each of Hui Cao and Hui Wang completes a transfer of equity interest and ceases to hold any equity interest in Qunar Beijing. In enforcing the pledge, Qunar Software is entitled to dispose of the pledge and have priority in receiving payment from proceeds from the auction or sale of all or part of the pledge until the obligations are settled. The terms of this agreement are otherwise substantially similar to the terms described in the foregoing paragraph.

Loan Agreements: Under the loan agreements we entered into with the shareholders of our consolidated affiliated Chinese entities, except for Hui Cao and Hui Wang, we extended long-term business loans to these shareholders of our consolidated affiliated Chinese entities with the sole purpose of providing funds necessary for the capitalization or acquisition of such consolidated affiliated Chinese entities. These business loan amounts were injected into the applicable consolidated affiliated Chinese entities as capital and cannot be accessed for any personal uses. The loan agreements shall remain effective until the parties have fully performed their respective obligations under the agreement, and the shareholders of such consolidated affiliated Chinese entities have no right to unilaterally terminate these agreements. In the event that the PRC government lifts its substantial restrictions on foreign ownership of the air-ticketing, travel agency, or value-added telecommunications business in China, as applicable, we will exercise our exclusive option to purchase all of the outstanding equity interests of our consolidated affiliated Chinese entities, as described in the following paragraph, and the loan agreements will be cancelled in connection with such purchase. However, it is uncertain when, if at all, the PRC government will lift any or all of these restrictions.

As of the date of this annual report, pursuant to the loan agreement among Qunar Software, Hui Cao and Hui Wang, the loans extended by Qunar Software to each of Hui Cao and Hui Wang are only repayable by a transfer of such borrower’s equity interest in Qunar Beijing to Qunar Software or its designated party, in proportion to the amount of the loan to be repaid. This loan agreement will continue in effect indefinitely until such time when (i) the borrowers receive a repayment notice from Qunar Software and fully repay the loans, or (ii) an event of default (as defined therein) occurs unless Qunar Software sends a notice indicating otherwise within 15 calendar days after it is aware of such event. The terms of this loan agreement is otherwise substantially similar to the terms described in the foregoing paragraphs.

Exclusive Option Agreements: As consideration for our entering into the loan agreements described above, each of the shareholders of our consolidated affiliated Chinese entities, except for Hui Cao and Hui Wang, has granted us an exclusive, irrevocable option to purchase, or designate one or more person(s) at our discretion to purchase, all of their equity interests in the applicable consolidated affiliated Chinese entities at any time we desire, subject to compliance with the applicable PRC laws and regulations. We may exercise the option by issuing a written notice to the relevant consolidated affiliated Chinese entity. The purchase price shall be equal to the contribution actually made by the shareholder for the relevant equity interest. Therefore, if we exercise these options, we may choose to cancel the outstanding loans we extended to the shareholders of such consolidated affiliated Chinese entities pursuant to the loan agreements as the loans were used solely for equity contribution purposes. The initial term of these agreements is 10 years and may be renewed automatically in 10-year terms unless we disapprove the extension. We retain the exclusive right to terminate the agreements at any time by delivering a written notice to the applicable consolidated affiliate Chinese entity.

Hui Cao and Hui Wang also entered into an equity option agreement with Qunar, Qunar Software and Qunar Beijing. This equity option agreement contains arrangements that are similar to that as described in the foregoing paragraph. This agreement will remain effective with respect to each of Qunar Beijing’s shareholders until all of the equity interest has been transferred or Qunar and Qunar Software terminates the agreement unilaterally with 30 days’ prior written notice.

Our consolidated affiliated Chinese entities and their shareholders agree not to enter into any transaction that would affect the assets, obligations, rights or operations of our consolidated affiliated Chinese entities without our prior written consent. They also agree to accept our guidance with respect to day-to-day operations, financial management systems and the appointment and dismissal of key employees.

Risks in relation to contractual arrangements between the Company’s PRC subsidiaries and its affiliated Chinese entities:

The Company has been advised by Commerce & Finance Law Offices, its PRC legal counsel, that its contractual arrangements with its consolidated VIEs as described in the Company’s annual report are valid, binding and enforceable under the current laws and regulations of China. Based on such legal opinion and the management’s knowledge and experience, the Company believes that its contractual arrangements with its consolidated VIEs are in compliance with current PRC laws and legally enforceable. However, there may be in the event that the affiliated Chinese entities and their respective shareholders fail to perform their contractual obligations, the Company may have to rely on the PRC legal system to enforce its rights. The PRC legal system is based on written statutes. Prior court decisions may be cited for reference but have limited precedential value. Since 1979, PRC legislation and regulations have significantly enhanced the protections afforded to various forms of foreign investments in China. However, since the PRC legal system is still evolving, the interpretations of many laws, regulations and rules are not always uniform and enforcement of these laws, regulations and rules involve uncertainties, which may limit remedies available to us. In addition, any litigation in China may be protracted and result in substantial costs and diversion of resources and management attention. Due to the uncertainties with respect to the PRC legal system, the PRC government authorities may ultimately take a view contrary to the opinion of its PRC legal counsel with respect to the enforceability of the contractual arrangements.

There are, however, substantial uncertainties regarding the interpretation and application of current or future PRC laws and regulations. Accordingly, the Company cannot be assured that the PRC government authorities will not ultimately take a view that is contrary to the Company’s belief and the opinion of its PRC legal counsel. On January 19, 2015, the Ministry of Commerce of the PRC, or (the “MOFCOM”) released for public comments a proposed PRC law (the “Draft FIE Law”) which includes VIEs within the scope of entities that could be considered to be foreign invested enterprises (or “FIEs”) and may be subject to restrictions under existing PRC law on foreign investment in certain categories of industries. Specifically, the Draft FIE Law introduces the concept of “actual control” for determining whether an entity is considered to be an FIE. In addition to control through direct or indirect ownership on equity, the Draft FIE Law includes control through contractual arrangements within the definition of “actual control.” If the Draft FIE Law is passed by the People’s Congress of the PRC and goes into effect in its current form, these provisions regarding control through contractual arrangements could be construed to reach the Company’s VIE arrangements, and as a result the Company’s VIEs could become explicitly subject to the current restrictions on foreign investment in certain categories of industry. The Draft FIE Law includes provisions that would exempt from the definition of FIEs where the ultimate controlling shareholders are either entities organized under PRC law or individuals who are PRC citizens. The Draft FIE Law is silent as to what type of enforcement action might be taken against existing VIEs that operate in restricted or prohibited industries and are not controlled by entities organized under PRC law or individuals who are PRC citizens. If the contractual arrangements establishing the Company’s VIE structure are found to be in violation of any existing law and regulations or future PRC laws and regulations or under the Draft FIE Law if it becomes effective, the relevant PRC government authorities will have broad discretion in dealing with such violation, including, without limitation, levying fines, confiscating our income or the income of our affiliated Chinese entities, revoking our business licenses or the business licenses of our affiliated Chinese entities, requiring us and our affiliated Chinese entities to restructure our ownership structure or operations and requiring us or our affiliated Chinese entities to discontinue any portion or all of our value-added telecommunications, air-ticketing, travel agency or advertising businesses. Any of these actions could cause significant disruption to the Company’s business operations, and have a severe adverse impact on the Company’s cash flows, financial position and operating performance. If the imposing of these penalties cause the Company to lose its rights to direct the activities of and receive economic benefits from its VIEs, which in turn may restrict the Company’s ability to consolidate and reflect in its financial statements the financial position and results of operations of its VIEs.

Summary financial information of the Group’s VIEs in the consolidated financial statements

Pursuant to the contractual arrangements with the VIEs, the Company has the power to direct activities of the VIEs, and can have assets transferred freely out of the VIEs without any restrictions. Therefore the Company considers that there is no asset of a consolidated VIE that can be used only to settle obligations of the VIE, except for registered capital and PRC statutory reserves of the VIEs amounting to a total of RMB922 million as of December 31, 2017. As all the consolidated VIEs are incorporated as limited liability companies under the PRC Company Law, creditors of the VIEs do not have recourse to the general credit of the Company for any of the liabilities of the consolidated VIEs.

Summary financial information of the VIEs, which represents aggregated financial information of the VIEs and their respective subsidiaries included in the accompanying consolidated financial statements, is as follows:

	As of December 31,
	2016		2017
	RMB		RMB
Total assets	30,544,580,876		21,755,512,736
Less: Inter-company receivables	(2,050,819,348	)	(1,569,895,648	)

Total assets excluding inter-company	28,493,761,528		20,185,617,088

Total liabilities	29,101,732,239		19,282,345,546

Less: Inter-company payables	(15,904,065,265	)	(12,114,432,077	)

Total liabilities excluding inter-company	13,197,666,974		7,167,913,469

As of December 31, 2016 and 2017, the VIEs’ assets mainly consisted of cash and cash equivalent (December 31, 2016: RMB10.0 billion, December 31, 2017: RMB6.6 billion), short-term investment (December 31, 2016: RMB6.5 billion, December 31, 2017: RMB6.1 billion), accounts receivables (December 31, 2016: RMB3.9 billion, December 31, 2017: RMB3.3 billion), prepayments and other current assets (December 31, 2016: RMB3.5 billion, December 31, 2017: RMB1.9 billion) and investments (non-current) (December 31, 2016: RMB2.8 billion, December 31, 2017: RMB1.4 billion). The inter-company receivables of RMB2.1 billion and RMB1.6 billion as of December 31, 2016 and 2017 mainly represented the cash paid by a VIE to one of the Company’s WFOEs for treasury cash management purpose.

As of December 31, 2016 and 2017, the VIEs’ liabilities mainly consisted of accounts payable (December 31, 2016: RMB4.3 billion, December 31, 2017: RMB3.3 billion), other payables and accruals (December 31, 2016: RMB1.3 billion, December 31, 2017: RMB1.5 billion), advance from customers (December 31, 2016: RMB5.0 billion, December 31, 2017: RMB1.1 billion) and short-term debt (December 31, 2016: RMB1.2 billion, December 31, 2017: RMB0.8 billion). The inter-company payables as of December 31, 2016 and 2017 were RMB15.9 billion and RMB12.1 billion, respectively, which primarily consisted of the payables due to Ctrip.com (Hong Kong) Limited (“Ctrip HK”), one of the Company’s wholly-owned subsidiaries, for its payment of overseas air tickets and tour packages on behalf of a VIE and another VIEs’ subsidiary and the service fees payable to the WFOEs under the technical consulting and services agreements, which are operational in nature from the VIEs and their subsidiaries’ perspectives.

The following table set forth the summary of results of operations of the VIEs and their subsidiaries of the Company:

	For the year ended December 31,
	2015		2016	2017
	RMB		RMB	RMB
Net revenues	6,384,556,234		8,706,139,377	8,237,250,837
Cost of revenues	1,983,511,461		2,442,997,433	2,489,892,564
Net income / (loss)	(73,523,163	)	100,653,423	863,231,207

As aforementioned, the VIEs mainly conduct transportation ticketing and advertising businesses. Revenues from VIEs accounted for around 31% of the Company’s total revenues in 2017. The air-ticketing continued to increase in 2017, primarily driven by the increase in the air-ticketing volume.

The VIEs’ net income before the deduction of the inter-company consulting fee charges were RMB1.0 billion, RMB2.8 billion and RMB2.7 billion for the years ended December 31, 2015, 2016 and 2017, respectively.

The WFOEs are the sole and exclusive provider of technical consulting and related services and information services for the VIEs. Pursuant to the Exclusive Technical Consulting and Service Agreements, the VIEs pay service fees to the WFOEs based on the VIEs’ actual operating results. The WFOEs are entitled to receive substantially all of the net income and transfer a majority of the economic benefits in the form of service fees from the VIEs and VIEs’ subsidiaries to the WFOEs. For remaining undistributed retained earnings, tax planning strategies are in place to support their enterprise income tax free treatment.

The amount of service fees paid by all the VIEs as a percentage of the VIEs’ total net income were 107.1%, 96.3% and 68.3% for the years ended December 31, 2015, 2016 and 2017, respectively.

The following tables set forth the summary of cash flow activities of the VIEs and their subsidiaries of the Company:

	For the year ended December 31,
	2015	2016	2017
	RMB	RMB	RMB
Net cash provided by operating activities	160,298,446	7,190,925,721	1,232,432,873
Net cash used in investing activities	—	—	—
Net cash provided by financing activities	—	—	—

Currently there is no contractual arrangement that could require the Company to provide additional financial support to the consolidated VIEs. As the Company is conducting certain business in the PRC mainly through the VIEs, the Company may provide such support on a discretionary basis in the future, which could expose the Company to a loss.

Foreign currencies

The Group’s reporting currency is RMB. The Company’s functional currency is US$. The Company’s operations are conducted through the subsidiaries and VIEs where the local currency is the functional currency and the financial statements of those subsidiaries are translated from their respective functional currencies into RMB.

Transactions denominated in currencies other than functional currencies are translated at the exchange rates quoted by the People’s Bank of China (the “PBOC”), the Hong Kong Association of Banks (the “HKAB”) or major Taiwan banks, prevailing or averaged at the dates of the transaction for PRC and Hong Kong subsidiaries and ezTravel, a Taiwan subsidiary respectively. Gains and losses resulting from foreign currency transactions are included in the consolidated statements of income and comprehensive income. Monetary assets and liabilities denominated in foreign currencies are translated using the applicable exchange rates quoted by the PBOC, HKAB or banks located in Taiwan at the balance sheet dates. All such exchange gains and losses are included in the consolidated statements of income/(loss).

Assets and liabilities of the group companies are translated from their respective functional currencies to the reporting currency at the exchange rates at the balance sheet dates, equity accounts are translated at historical exchange rates and revenues and expenses are translated at the average exchange rates in effect during the reporting period. The exchange differences for the translation of group companies with non-RMB functional currency into the RMB are included in foreign currency translation adjustments, which is a separate component of shareholders’ equity on the consolidated financial statements.

Translations of amounts from RMB into US$ are solely for the convenience of the reader and were calculated at the rate of US$1.00 = RMB6.5063 on December 29, 2017, representing the certificated exchange rate published by the Federal Reserve Board. No representation is intended to imply that the RMB amounts could have been, or could be, converted, realized or settled into US$ at that rate on December 31, 2017, or at any other rate.

Cash and cash equivalents

Cash includes currency on hand and deposits held by financial institutions that can be added to or withdrawn without limitation. Cash equivalents represent short-term, highly liquid investments that are readily convertible to known amounts of cash and with original maturities from the date of purchase of generally three months or less.

Restricted cash

Restricted cash represents cash that cannot be withdrawn without the permission of third parties. The Group’s restricted cash is substantially cash balance on deposit required by its business partners and commercial banks.

Short-term investments

Short-term investments represent i) held-to-maturity investments which are due in one year and stated at amortized cost; and ii) the investments issued by commercial banks or other financial institutions with a variable interest rate indexed to the performance of underlying assets within one year. These investments are stated at fair value. Changes in the fair value are reflected in the consolidated statements of income and comprehensive income.

Loan receivable

The Company extends credit to its users by making payments on behalf of the users when they make bookings for travel products on the Company’s platforms. Such amounts are recorded at the outstanding principal amount less allowance for doubtful accounts, and include accrued interest receivable and presented in receivable from loans to the users in Note 3. For the years ended December 31, 2016 and 2017, the total allowance for the loans were not material and was presented in general and administrative expenses. The Company recognized the interest income from the loans in Revenue – Others. For the years ended December 31, 2016 and 2017, the interest incomes were not material.

The gross loan activities are presented in the investing section of the cash flow statement unless the term of the loan is 3 month or less, in which case it is presented on a net basis in the investing section.

Long-term loan receivables are recorded at cost and compounded accrued interests as we do not intend to sell the security, or it is more likely than not that the Company will not be required to sell the security before full recovery of our cost. The Company evaluates the qualitative criteria to determine whether we expect to recover our cost.

Land use rights

Land use rights represent the prepayments for usage of the parcels of land where the office buildings are located, are recorded at cost, and are amortized over their respective lease periods (usually over 40 to 50 years).

Property, equipment and software

Property, equipment and software are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the following estimated useful lives, taking into account any estimated residual value:

Building		30-40 years
Leasehold improvements		Lesser of the term of the lease or the estimated useful lives of the assets
Website-related equipment		5 years
Computer equipment		3-5 years
Furniture and fixtures		3-5 years
Software		3-5 years

The Company recognizes the disposal of Property, equipment and software in general and administrative expenses.

Investments

The Company’s investments include equity method investments, cost method investments, available-for-sale investments and held to maturity investments.

The Company applies equity method in accounting for its investments in entities in which the Company has the ability to exercise significant influence but does not have control and the investments are in either common stock or in-substance common stock. Unrealized gains on transactions between the Company and an affiliated entity are eliminated to the extent of the Company’s interest in the affiliated entity, unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the asset transferred.

For other equity investments that are not considered as debt securities or equity securities that have readily determinable fair values and over which the Company has neither significant influence nor control through investments in common stock or in-substance common stock, the cost method of accounting is used. Under the cost method, the Company carries the investment at cost and recognizes income to the extent of dividends received from the distribution of the equity investee’s post-acquisition profits.

The Company has classified its investments in debt securities and equity securities with readily determinable fair value as available-for-sale securities. These securities are recognized based on trade date and carried at estimated fair value with the aggregate unrealized gains and losses related to these investments, net of taxes, reported through other comprehensive income. Realized gains or losses are charged to earnings during the period in which the gains or losses are realized. Gain or losses are realized when such investments are sold or when dividends are declared or payments are received or when other than temporarily impaired.

The investments that the Company has positive intent and ability to hold to maturity are classified as held-to-maturity investments and are stated at amortized cost.

The Company monitors its investments for other-than-temporary impairment by considering factors including, but not limited to, current economic and market conditions, the operating performance of the companies including current earnings trends and other company-specific information.

Fair value measurement of financial instruments

Financial assets and liabilities of the Group primarily comprise of cash and cash equivalents, restricted cash, time deposits, financial products, accounts receivable, due from related parties, available-for-sale investments, accounts payable, due to related parties, advances from end users, short-term bank borrowings, other short-term liabilities and long-term debts. As of December 31, 2016 and 2017, the Company does not hold any derivative instruments, and except for long-term debts and available-for-sale investments, carrying values of these financial instruments approximated their fair values because of their generally short maturities. The Company reports available-for-sale investments at fair value at each balance sheet date and changes in fair value are reflected in the statements of income and comprehensive income. The Company disclosed the fair value of its long-term debts based on Level 2 inputs in Note 17.

The Company measures its financial assets and liabilities using inputs from the following three levels of the fair value hierarchy. The three levels are as follows:

Level 1 inputs are unadjusted quoted prices in active markets for identical assets that the management has the ability to access at the measurement date.

Level 2 inputs include quoted prices for similar assets in active markets, quoted prices for identical or similar assets in markets that are not active, inputs other than quoted prices that are observable for the asset (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level 3 includes unobservable inputs that reflect the management’s assumptions about the assumptions that market participants would use in pricing the asset. The management develops these inputs based on the best information available, including the own data.

Business combination

U.S. GAAP requires that all business combinations not involving entities or businesses under common control be accounted for under the acquisition method. The Group applies ASC 805, “Business combinations”, the cost of an acquisition is measured as the aggregate of the fair values at the date of exchange of the assets given, liabilities incurred, and equity instruments issued. The costs directly attributable to the acquisition are expensed as incurred. Identifiable assets, liabilities and contingent liabilities acquired or assumed are measured separately at their fair value as of the acquisition date, irrespective of the extent of any non-controlling interests. The excess of the (i) the total of cost of acquisition, fair value of the non-controlling interests and acquisition date fair value of any previously held equity interest in the acquiree over (ii) the fair value of the identifiable net assets of the acquiree is recorded as goodwill. If the cost of acquisition is less than the fair value of the net assets of the subsidiary acquired, the difference is recognized directly in the consolidated statements of income and comprehensive income.

The determination and allocation of fair values to the identifiable assets acquired and liabilities assumed is based on various assumptions and valuation methodologies requiring considerable management judgment. The most significant variables in these valuations are discount rates, terminal values, the number of years on which to base the cash flow projections, as well as the assumptions and estimates used to determine the cash inflows and outflows. Management determines discount rates to be used based on the risk inherent in the related activity’s current business model and industry comparisons. Terminal values are based on the expected life of products and forecasted life cycle and forecasted cash flows over that period. The Company’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. Any changes to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined.

Acquisitions

During the periods presented, the Company completed several transactions to acquire controlling shares to enrich its products and to expand business. The Company makes estimates and judgments in determining the fair value of the acquired assets and liabilities, based in part on independent appraisal reports as well as its experience with purchasing similar assets and liabilities in similar industries. The amount excess of the purchase price over the fair value of the identifiable assets and liabilities acquired is recorded as goodwill. The major acquisitions during the periods presented are as follows:

Skyscanner Holdings Limited (“Skyscanner”)

On December 9, 2016, the Company consummated an acquisition of nearly all the equity interest of Skyscanner with the total purchase consideration of £1.4 billion (RMB12.0 billion). The purchase consideration consists of £1.2 billion (RMB10 billion) in cash and Ctrip ordinary shares. The cash consideration was subsequently agreed with selling shareholder to adjust to RMB10.1 billion in 2017 for an increase of RMB60 million. The financial statements of Skyscanner are consolidated by the Company from December 31, 2016 onwards since the financial results of Skyscanner during the period from December 10, 2016 through December 31, 2016 were not material to the Company.

The net assets acquired based on their fair values was RMB325 million, including cash acquired with amount of RMB571 million. The fair value of non-controlling interest amounting to RMB316 million was measured based on the purchase price, taking into account a discount reflective of the non-controlling nature of the interest. The newly identifiable intangible assets were RMB3.1 billion which primarily consist of trademark and domain, supplier relationship and IT Platform. The trademark and domain are assessed to be indefinite-lived intangible assets. The fair values of the supplier relationship and IT Platform with amount of RMB929 million and RMB191 million respectively, are amortized over 9 years and 6 years, respectively on a straight-line basis. The deferred tax liability of RMB620 million as recognized in associated with the identifiable intangible assets. The goodwill recognized for the Skyscanner acquisition was RMB9.5 billion which primarily made up of the expected synergies from combining operations of the acquiree and the acquirer, which do not qualify for separate recognition. The final allocation of purchase price recorded in 2017 has reflected the subsequent adjustment of total consideration with a corresponding adjustment to goodwill (Note 10).

Qunar Cayman Islands Limited (“Qunar”)

In October 2015, the Company completed a share exchange transaction with Baidu, Inc. (“Baidu”), which was the principal shareholder of Qunar, upon completion of the exchange, the Company issued approximately 11 million ordinary shares, with the fair value of US$3.4 billion (RMB21.7 billion) to Baidu in exchange for approximately 179 million Class A (There were 193 million outstanding Class A shares in Qunar) and 11 million Class B ordinary share of Qunar. The Class A and Class B represents 3 votes and 1 vote per share respectively, and Class A ordinary shares were converted into Class B ordinary shares upon transfer. After the transaction, Ctrip owned ordinary share of Qunar representing approximately 45% of Qunar’s aggregate voting interest and 48% economic interest.

In connection with the transaction with Baidu, on December 10, 2015, the Company issued approximately 4 million ordinary shares to certain special purpose vehicles in exchange for approximately 66 million Class B ordinary shares of Qunar issued as equity incentives to Qunar’s employees.

Below is the summary of the fair value of acquisition cost for these acquisitions:

	RMB	US$
Fair value of previously held equity interest (1)	21,698,582,100	3,416,184,974
Consideration paid in December 2015	10,842,783,275	1,687,067,570

Total purchase cost	32,541,365,375	5,103,252,544

(1)

Which represents fair value of purchase consideration for the initial equity method investment in October 2015

As a result of the above transactions, the Company is deemed to be the beneficial owner of 256 million Class B ordinary shares of Qunar representing majority voting interest and therefore accounted for these transactions as step acquisitions of business combination under U.S GAAP. The previously held equity interest of Qunar from the exchange transaction with Baidu had been accounted for using equity method until the Company’s consolidation of Qunar upon completion of the transaction with the Qunar shareholders in December 2015 (Note 8). The financial statements of Qunar were consolidated by the Company from December 31, 2015 on since the financial results of Qunar during the period from December 10 through December 31, 2015 were not material.

The net liabilities assumed of Qunar based on fair values was RMB628 million, including cash and cash equivalents of RMB5.2 billion, prepayment and other current assets of RMB4.3 billion, non-current assets of RMB1 billion, short-term debt of RMB3.9 billion, other current liabilities of RMB7.1 billion and non-current liability of RMB93 million. The fair value of non-controlling interest amounting to RMB17.9 billion was measured based on the purchase price, taking into account a discount reflective of the non-controlling nature of the interest based on the market price of Qunar’s publically traded shares.

The newly identifiable intangible assets of Qunar was RMB9.9 billion which primarily consist of trademark and domain, technology and supplier network for new products. The technology and supplier network for new products are finite-lived intangible assets with aggregated amount of RMB0.9 billion. The trademark and domain are indefinite-lived intangible assets with aggregated amount if RMB9 billion. The estimated fair value of the amortizable intangible assets (technology and supplier network for new products) is expected to amortised over a weighted average period of 5.2 years on a straight-line basis. The deferred tax liability of RMB2.5 billion as recognized is associated with the identifiable intangible assets.

The goodwill recognized from the Qunar acquisition was RMB43.6 billion which primarily attributable to the expected synergies from the consolidation of the seamless cooperation of the acquiree and the acquirer to further build and strengthen the vibrant travel ecosystem of the enlarged group. Such synergies, in order of their relative significance, are comprised of (1) the expected but unidentifiable significant business growth as a result of the consolidation of the fragmented domestic online travel market; (2) the strengthened market position from the increased market presence by the penetration into the supplementary travel related market of each other; (3) the enhanced relationship with other travel service providers and increased popularity and awareness among end users; and (4) the operation efficiencies and reductions in costs by eliminating redundant processes and facilities. In addition, the goodwill also includes the work force that is not separately recognized in the purchase price allocation.

For the years ended December 31, 2016 and 2017, the Company made certain investments, in the form of limited partnership capital contribution or other financing arrangements, in several non-U.S. investment entities, with fair values of approximately US$2.9 billion and US$0.4 billion in 2016 and 2017, respectively (the “Investment”). These investment entities have spent the Investment to acquire the equity interest of Qunar that was not held by the Company, through privately negotiated transactions. In accordance with ASC 810, the Company consolidates the financial statements of these investment entities and as such the investments were eliminated in consolidation. The Company accounts for the purchases of the Qunar non-controlling shares as equity transactions by adjusting the carrying amount of non-controlling interest of Qunar to reflect the decrease in the non-controlling interest’s ownership in Qunar by RMB15.5 billion and RMB2.2 billion in 2016 and 2017 respectively. The difference between the amount of the change in non-controlling interest and the consideration paid was recognized in additional paid-in capital of the Company with amount of RMB3.7 billion and RMB0.6 billion in 2016 and 2017 respectively.

The following unaudited pro forma consolidated financial information reflects the results of operations for the year ended 2015, as if the business combination had occurred on January 1, 2014, and after giving effect to purchase accounting adjustments. These pro forma results have been prepared for comparative purposes only and do not purport to be indicative of what operating results would have been had the acquisitions actually took place on the beginning of the periods presented, and may not be indicative of future operating results.

In thousands	2015
	RMB
Pro-forma net revenues	14,812,533
Pro-forma net loss	(5,086,934	)

For the years ended December 31, 2015, 2016 and 2017, other than the business combination of Qunar, the financial results and the pro forma revenues and net earnings of above mentioned acquisitions were not considered as significant to the Group under ASC 805 respectively, either individually or in aggregate.

Other than the acquisitions disclosed above, none of other acquisition occurred during the periods presented was material to our businesses or financial results. Other immaterial acquisitions in 2015, 2016 and 2017 with total consideration of RMB862 million, RMB120 million and RMB251 million respectively resulted in goodwill increase of RMB817 million, RMB159 million and RMB291 million respectively.

Goodwill and other intangible assets

Goodwill represents the excess of the purchase price over the fair value of the identifiable assets and liabilities acquired as a result of the Company’s acquisitions of interests in its subsidiaries and consolidated VIEs.

Goodwill is not amortized but is reviewed at least annually for impairment or earlier, if an indication of impairment exists. Recoverability of goodwill is evaluated using a two-step process. In the first step, the fair value of a reporting unit is compared to its carrying value. If the fair value of a reporting unit exceeds the carrying value of the net assets assigned to a reporting unit, goodwill is considered not impaired and no further testing is required. If the carrying value of the net assets assigned to a reporting unit exceeds the fair value of a reporting unit, the second step of the impairment test is performed in order to determine the implied fair value of a reporting unit’s goodwill. Determining the implied fair value of goodwill requires valuation of a reporting unit’s tangible and intangible assets and liabilities in a manner similar to the allocation of purchase price in a business combination. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, goodwill is deemed impaired and is written down to the extent of the difference. The Company estimates total fair value of the reporting unit using discounted cash flow analysis, and makes assumptions regarding future revenue, gross margins, working capital levels, investments in new products, capital spending, tax, cash flows, and the terminal value of the reporting unit.

As of December 31, 2017, the step one analysis performed indicated that the fair value of the Company’s reporting unit was substantially greater than the respective carrying value. There was no impairment of goodwill during the years ended December 31, 2015, 2016 and 2017. Each quarter the Company reviews the events and circumstances to determine if goodwill impairment may be indicated.

Separately identifiable intangible assets that have determinable lives continue to be amortized and consist primarily of non-compete agreements, customer list, supplier relationship, technology and business relationship as of December 31, 2016 and 2017. The Company amortizes intangible assets on a straight-line basis over their estimated useful lives, which is three to ten years. The estimated life of amortized intangibles is reassessed if circumstances occur that indicate the life has changed. Other intangible assets that have indefinite useful life primarily include trademark and domain names as of December 31, 2016 and 2017. The Company evaluates indefinite-lived intangible assets each reporting period to determine whether events and circumstances continue to support an indefinite useful life. If an intangible asset that is not being amortized is subsequently determined to have a finite useful life, the asset is tested for impairment. The Company estimates total fair value of the reporting unit using discounted cash flow analysis, and makes assumptions regarding future revenue, gross margins, working capital levels, investments in new products, capital spending, tax, cash flows, and the terminal value of the reporting unit.

The Company reviews intangible assets with indefinite lives annually for impairment.

No impairment on other intangible assets was recognized for the years ended December 31, 2015, 2016 and 2017.

Impairment of long-lived assets

Long-lived assets (including intangible with definite lives) are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Reviews are performed to determine whether the carrying value of asset group is impaired, based on comparison to undiscounted expected future cash flows. If this comparison indicates that there is impairment, the Group recognizes impairment of long-lived assets to the extent the carrying amount of such assets exceeds the fair value.

Accrued liability for customer reward program

The Group’s end users participate in a loyalty points program, which substantially provides gifts to members based on accumulated membership points that vary depending on the services rendered and fees paid. The estimated incremental costs to provide gifts are recognized as sales and marketing expense and accrued for as a current liability because it relates to gifts rather than cash rewards, refund or rebate of the services rendered by the Company. As members redeem awards or their entitlements expire, the accrued liability is reduced correspondingly. As of December 31, 2016 and 2017, the Group’s accrued liability for its customer reward program amounted to RMB658 million and RMB610 million, respectively, based on the estimated liabilities under the customer reward program. The expenses recognized for the customer rewards program were approximately RMB399 million, RMB202 million and RMB100 million for the years ended December 31, 2015, 2016 and 2017.

Deferred revenue

The Group has a coupon program, through which the Group provides coupons for end users who book selected hotels online through website. The end users who use the coupons receive credits in their virtual cash accounts upon check-out from the hotels and reviews for hotels submitted. The end users may redeem the amount of credits in their virtual cash account in cash or voucher for their future bookings on the Company’s website and mobile platforms. The Group accounts for the estimated cost of future usage of coupons as reduction of the revenue.

Revenue recognition

The Group presents substantially all of its revenues on a net basis. Revenues are recognized at gross amounts where the Group undertakes the majority of the business risks by pre-purchasing inventories and acts as principal related to the services provided. The amount of revenues recognized at gross basis was immaterial during the years ended December 31, 2015, 2016 and 2017, respectively.

Accommodation reservation services

The Group receives commissions from travel suppliers for hotel room reservations through the Group’s transaction and service platform. Commissions from hotel reservation services rendered are recognized after end users have completed their stay at the applicable hotel and upon confirmation of pending payment of the commissions by the hotel. Contracts with certain travel suppliers contain incentive commissions typically subject to achieving specific performance targets and such incentive commissions are recognized when it is reasonably assured that the Group is entitled to such incentive commissions. The Group generally receives incentive commissions from monthly arrangements with hotels based on the number of hotel room reservations where end users have completed their stay. The Group presents revenues from such transactions on a net basis in the statements of income and comprehensive income as the Group, generally, does not assume inventory risks and has no obligations for cancelled hotel reservations.

Transportation ticketing services

Transportation ticketing services revenues mainly represent revenues from tickets reservations and other related services. The Group receives commissions from travel suppliers for ticketing services through the Group’s transaction and service platform under various services agreements. Commissions from ticketing services rendered are recognized after tickets are issued. The Group presents revenues from such transactions on a net basis in the statements of income as the Group, generally, does not assume inventory risks and has no obligations for cancelled airline ticket reservations. Loss due to obligations for cancelled ticket reservations is minimal in the past.

Packaged-tour

The Group receives referral fees from travel product providers for packaged-tour products and services through the Group’s transaction and service platform. Referral fees are recognized as commissions on a net basis after the packaged-tour service are rendered and collections are reasonably assured.

Corporate travel

Corporate travel management revenues primarily include commissions from air ticket booking, hotel reservation and packaged-tour services rendered to corporate clients. The Group contracts with corporate clients based on service fee model. Travel reservations are made via on-line and off-line services for air tickets, hotel and package-tour. Revenue is recognized on a net basis after the services are rendered, e.g. air tickets are issued, hotel stays or packaged-tour are completed, and collections are reasonably assured.

Other businesses

Other businesses comprise primarily of online advertising services.

The Company receives advertising revenues, which principally represent the sale of banners or sponsorship on the website and mobile from end users. Advertising revenues are recognized ratably over the fixed term of the agreement as services are provided.

Allowance for doubtful accounts

Accounts receivables are recorded at the invoiced amount and do not bear interest. The Company reviews on a periodic basis for doubtful accounts for the outstanding trade receivable balances based on historical experience and information available. Additionally, we make specific bad debt provisions based on (i) our specific assessment of the collectability of all significant accounts; and (ii) any specific knowledge we have acquired that might indicate that an account is uncollectible. The facts and circumstances of each account may require us to use substantial judgment in assessing its collectability. The following table summarized the details of the Company’s allowance for doubtful accounts:

	2015		2016		2017
	RMB		RMB		RMB
Balance at beginning of year	14,707,184		38,237,658		58,841,826
Provision for doubtful accounts	32,080,786		32,339,617		97,944,278
Write-offs	(8,550,312	)	(11,735,449	)	(28,064,747	)

Balance at end of period	38,237,658		58,841,826		128,721,357

Cost of revenues

Cost of revenues consists primarily of payroll compensation of customer service center personnel, payments to travel suppliers, credit card service fee, telecommunication expenses, direct cost of principal travel tour services, depreciation, rentals and related expenses incurred by the Group’s transaction and service platform which are directly attributable to the rendering of the Group’s travel related services and other businesses.

Product development

Product development expenses include expenses incurred by the Group to develop the Group’s travel supplier networks as well as to maintain, monitor and manage the Group’s transaction and service platform. The Group recognizes website, software and mobile applications development costs in accordance with ASC 350-50 “Website development costs” and ASC 350-40 “Software — internal use software” respectively. The Group expenses all costs that are incurred in connection with the planning and implementation phases of development and costs that are associated with repair or maintenance of the existing websites and mobile applications or the development of software or mobile applications for internal use and websites content.

Sales and marketing

Sales and marketing expenses consist primarily of costs of payroll and related compensation for the Company’s sales and marketing personnel, advertising expenses, and other related marketing and promotion expenses. Advertising expenses, amounting to approximately RMB1.8 billion, RMB2.8 billion and RMB5.1 billion for the years ended December 31, 2015, 2016 and 2017 respectively, are charged to the statements of income as incurred.

Share-based compensation

Under ASC 718, the Company applied the Black-Scholes valuation model in determining the fair value of options granted. Risk-free interest rates are based on US Treasury yield for the terms consistent with the expected life of award at the time of grant. Expected life is based on historical exercise patterns. Expected dividend yield is determined in view of the Company’s historical dividend payout rate and future business plan. The Company estimates expected volatility at the date of grant based on historical volatilities. The Company recognizes compensation expense on all share-based awards on a straight-line basis over the requisite service period. Forfeiture rate is estimated based on historical forfeiture patterns and adjusted to reflect future change in circumstances and facts, if any. If actual forfeitures differ from those estimates, the Company may need to revise those estimates used in subsequent periods.

According to ASC 718, a change in any of the terms or conditions of stock options shall be accounted for as a modification of the plan. Therefore, the Company calculates incremental compensation cost of a modification as the excess of the fair value of the modified option over the fair value of the original option immediately before its terms are modified, measured based on the share price and other pertinent factors at the modification date. For vested options, the Company would recognize incremental compensation cost in the period the modification occurs and for unvested options, the Company would recognize, over the remaining requisite service period, the sum of the incremental compensation cost and the remaining unrecognized compensation cost for the original award on the modification date.

According to ASC 718, the Company classifies options or similar instruments as liabilities if the entity can be required under any circumstances to settle the option or similar instrument by transferring cash or other assets and such cash settlement is probable. The percentage of the fair value that is accrued as compensation cost at the end of each period shall equal the percentage of the requisite service that has been rendered at that date. Changes in fair value of the liability classified award that occur during the requisite service period shall be recognized as compensation cost over that period. Changes in fair value that occur after the end of the requisite service period are compensation cost of the period in which the changes occur. Any difference between the amount for which a liability award is settled and its fair value at the settlement date as estimated is an adjustment of compensation cost in the period of settlement.

Share incentive plans

In November, 2004, the Company’s board of directors adopted a 2005 Employee’s Stock Option Plan (“2005 Option Plan”). As of December 31, 2016 and 2017, 107,572 and nil options were outstanding under the 2005 Option Plan respectively.

In October, 2007, the Company adopted a 2007 Share Incentive Plan (“2007 Incentive Plan”). The Company granted 937,002 and 138,061 new shares options to employees with 4 year requisite service period for years ended December 31, 2016 and 2017, respectively. RSUs granted under 2007 Incentive Plan have a restricted period for 4 years. As of December 31, 2016 and 2017, 5,424,943 and 4,367,099 options and 1,462,239 and 1,095,722 RSUs were outstanding under the 2007 Incentive Plan.

In June, 2017, the Company adopted a Global Share Incentive Plan (“Global Incentive Plan”), under which the Company granted 493,105 new share options to employees with 4 year requisite service period for year ended December 31, 2017. As of December 31, 2017, 343,659 options were outstanding under the Global Incentive Plan.

Qunar previously adopted the 2007 Qunar Share Inventive Plan and 2015 Qunar Share Inventive Plan. Immediately prior to the closing of its going private transaction in February 2017, each outstanding vested option granted under the 2007 Qunar Share Incentive Plan and the 2015 Qunar Share Incentive Plan was exchanged for a number of Ctrip ADSs based on a ratio that ensures equivalent economic value, against the payment by the holder of the vested Qunar options of the full amount of exercise price payable; and each outstanding unvested Qunar option granted under the 2007 Qunar Share Incentive Plan and the 2015 Qunar Share Incentive Plan was exchanged for an option of Ctrip to purchase ordinary shares of Ctrip based on a ratio that ensures equivalent economic value with its remaining vesting period unchanged (“Exchange of Qunar Share Incentive Plans”).

A summary of option activity under the share incentive plans

The following table summarized the Company’s share option activity under all the option plans, which has reflected the effect of the Exchange of Qunar Share Incentive Plans (in US$, except shares):

	Number of Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2014	4,972,178		101.03	5.17	405,399,251

Granted	625,006		247.91
Exercised	(506,163)		65.65
Forfeited	(85,560)		156.32

Outstanding at December 31, 2015	5,005,461		122.00	4.77	1,244,544,670

Granted	937,002		322.20
Exercised	(368,722	)	80.70
Forfeited	(41,226	)	199.32

Outstanding at December 31, 2016	5,532,515		157.82	4.54	899,966,907

Granted (including grants in exchange for Qunar options )	631,166		43.03
Exercised	(1,353,697	)	68.95
Forfeited	(99,226	)	133.92

Outstanding at December 31, 2017	4,710,758		168.80	4.72	866,781,417

Vested and expect to vest at December 31, 2017	4,570,018		167.40	4.67	847,267,373

Exercisable at December 31, 2017	2,951,517		141.77	3.78	622,855,872

The Company’s current practice is to issue new shares to satisfy share option exercises.

The expected-to-vest options are the result of applying the pre-vesting forfeiture rate assumptions of 8% to total unvested options.

The aggregate intrinsic value in the table above represents the total intrinsic value (the aggregate difference between the Company’s closing stock price of US$ 352.80 as of December 31, 2017 and the exercise price for in-the-money options) that would have been received by the option holders if all in-the-money options had been exercised on December 31, 2017.

The total intrinsic value of options exercised during the years ended December 31, 2015, 2016 and 2017 were US$178 million, US$257 million and US$522 million, respectively.

The following table summarizes information related to outstanding and exercisable options as of December 31, 2017 (in US$, except shares):

	Outstanding			Exercisable
Range of Exercise Prices	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)
0.00-100.00	1,671,410	61.24	3.90	1,306,991	78.31	2.93
100.01-200.00	1,460,228	155.54	3.84	1,128,628	151.22	3.67
200.01-300.00	664,262	253.65	5.72	299,221	250.70	5.69
300.01-400.00	914,858	324.87	6.88	216,677	324.92	6.87

	4,710,758			2,951,517

The weighted average fair value of options granted during the years ended December 31, 2015, 2016 and 2017 was US$109.93, US$140.95 and US$376.78 per share, respectively.

As of December 31, 2017, there was US$262 million of total unrecognized compensation cost, net of estimated forfeitures, related to unvested share options which are expected to be recognized over a weighted average period of 2.7 year. Total unrecognized compensation cost may be adjusted for future changes in estimated forfeitures. Total cash received from the exercise of share options amounted to RMB52 million, RMB212 million and RMB732 million for the year ended December 31, 2015, 2016 and 2017, respectively. The transfer agent was engaged by the Company to collect the exercise proceeds and remitted on regular basis and these amounts were presented as receivable from financial institution in Note 3.

The Company calculated the estimated fair value of share options on the date of grant using the Black-Scholes pricing model with the following assumptions for the years ended December 31, 2015, 2016 and 2017:

	2015	2016	2017
Risk-free interest rate	1.35%-1.59%	1.16%-1.66%	1.73%-1.94%
Expected life (years)	5.0	5.0	5.0
Expected dividend yield	0%	0%	0%
Volatility	49%-50%	48%-51%	46%-48%
Fair value of options at grant date per share	from US$105.16	from US$133.85	from US$142.29
	to US$112.76	to US$141.72	to US$430.87

For the years ended December 31, 2015, 2016 and 2017, the Company granted 229,603, 1,183,094 and 15,664 RSUs to employees with 4 year requisite service period, respectively.

The following table summarized the Company’s RSUs activities under all incentive plans (in US$, except shares):

			Weighted
			average grant
	Number of		date fair
	Shares		value(US$)
Restricted shares
Unvested at December 31, 2014	1,058,608		158.55

Granted	229,603		249.31
Vested	(271,683	)	129.21
Forfeited	(151,120	)	181.47

Unvested at December 31, 2015	865,408		185.17

Granted	1,183,094		301.62
Vested	(492,825	)	223.00
Forfeited	(93,438	)	237.69

Unvested at December 31, 2016	1,462,239		263.28

Granted	15,664		323.92
Vested	(285,375	)	191.21
Forfeited	(96,806	)	274.71

Unvested at December 31, 2017	1,095,722		281.91

Total share-based compensation cost for the RSUs amounted to US$48.6 million, US$217.8 million and US$281.9 million for the years ended December 31, 2015, 2016 and 2017, respectively. As of December 31, 2017, there was US$183 million unrecognized compensation cost, net of estimated forfeitures, related to unvested restricted shares, which are to be recognized over a weighted average vesting period of 1.3 years. Total unrecognized compensation cost may be adjusted for future changes in estimated forfeitures. The Company determined the fair value of RSUs based on its stock price on the date of grant.

Operating leases

Leases where substantially all the rewards and risks of ownership of assets remain with the leasing company are accounted for as operating leases. Payments made under operating leases net of any incentives received by the Group from the leasing company are charged to the statements of income on a straight-line basis over the lease periods.

Taxation

Deferred income taxes are provided using the balance sheet liability method. Under this method, deferred income taxes are recognized for the tax consequences of significant temporary differences by applying enacted statutory rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The tax base of an asset or liability is the amount attributed to that asset or liability for tax purposes. The effect on deferred taxes of a change in tax rates is recognized in income in the period enacted. A valuation allowance is provided to reduce the amount of deferred tax assets if it is considered unlikely that some portion of, or all of, the deferred tax assets will not be realized.

The Company applies ASC 740, “Income Taxes”. It clarifies the accounting for uncertainty in income taxes recognized in the Company’s consolidated financial statements and prescribes a more likely than not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. It also provides guidance on derecognition of income tax assets and liabilities, classification of current and deferred income tax assets and liabilities, accounting for interest and penalties associated with tax positions, accounting for income taxes in interim periods, and income tax disclosures.

Other income/ (expense)

Other income/ (expense) consists of gain on deconsolidation of subsidiaries, financial subsidies, investment income and foreign exchange gains/(losses) etc.. Financial subsidies from local PRC government authorities are recorded as other income in the consolidated statements of income. There are no defined rules and regulations to govern the criteria necessary for companies to enjoy such benefits and the amount of financial subsidy are determined at the discretion of the relevant government authorities. Financial subsidies are recognized as other income when received. The foreign exchange losses in 2016 were mainly contributed by the USD appreciation against Chinese Yuan. Components of other income for the years ended December 31, 2015, 2016 and 2017 were as follows:

	2015		2016		2017
	RMB		RMB		RMB
Gain on disposal of cost method investment (Note 8)	—		149,066,258		1,374,462,407
Foreign exchange gains/(losses)	12,638,982		(557,995,284	)	468,671,832
Subsidy income	199,418,778		220,631,285		263,538,347
Gain on disposal of available-for-sale investment (Note 8)	—		140,651,759		39,951,298
Dividends from long-term investment	—		48,911,066		46,550,230
Gain on disposal of a subsidiary	—		—		11,412,387
Gain on deconsolidation of subsidiaries	2,294,451,702		252,000		—
Impairments of cost method investments	—		(11,628,980	)	(139,271,481	)
Impairments of available-for-sale investments	—		(36,357,902	)	(271,707,804	)
Provision/impairment for an equity method investment (Note 8 and Note 13)	—		—		(967,395,005	)
Others	(25,529,632	)	19,621,511		52,785,926

Total	2,480,979,830		(26,848,287	)	878,998,137

Statutory reserves

The Company’s PRC subsidiaries and the VIEs are required to allocate at least 10% of their after-tax profit to the general reserve in accordance with the PRC accounting standards and regulations. The allocation to the general reserve will cease if such reserve has reached to 50% of the registered capital of respective company. Appropriations to discretionary surplus reserve are at the discretion of the board of directors of the subsidiaries and VIEs. These reserves can only be used for specific purposes and are not transferable to the Company in form of loans, advances, or cash dividends. Additionally, ezTravel, the Company’s subsidiary incorporated in Taiwan, is also required to allocate 10% of its after-tax profit to the statutory reserve in accordance with Taiwan regulations. There is no such regulation of providing statutory reserve in Hong Kong. During the years ended December 31, 2015, 2016, and 2017, appropriations to statutory reserves have been made of approximately RMB35 million, RMB69 million, and RMB146 million, respectively.

Dividends

Dividends are recognized when declared.

PRC regulations currently permit payment of dividends only out of accumulated profits as determined in accordance with PRC accounting standards and regulations. The Company’s PRC subsidiaries can only distribute dividends after they have met the PRC requirements for appropriation to statutory reserves. Additionally, as the Company does not have any direct ownership in the VIEs, the VIEs cannot directly distribute dividends to the Company. The PRC government imposes control over its foreign currency reserves in part through direct regulation of the conversion of RMB into foreign exchange and through restrictions on foreign trade. As the majority of our revenues are in RMB, any restrictions on currency exchange may limit our ability to use revenue generated in RMB to fund our business activities outside China or to make dividend payments in U.S. dollars. However, the Company believes the restrictions on currency exchange imposed by the PRC foreign exchange regulations and enforced by SAFE do not automatically constitute the “restrictions” under Rule 4-08(e)(3) under Regulation S-X, because such restrictions in substance do not prohibit the Company’s subsidiaries or VIEs from transferring net assets to the Company in the combined forms of loans, advances and cash dividends without the consent of SAFE, provided that certain procedural formalities should be complied with. As of December 31, 2017, the restricted net assets of the Company’s PRC subsidiaries and VIEs not distributable in the form of dividends to the parent as a result of the aforesaid PRC regulations and other restrictions were RMB5.7 billion.

As a result of the aforementioned PRC regulation and the Company’s organizational structure, accumulated profits of the subsidiaries in PRC distributable in the form of dividends to the parent as of December 31, 2015, 2016 and 2017 were RMB7 billion, RMB8 billion and RMB12 billion, respectively. The Company’s PRC subsidiaries and VIEs are able to enter into royalty and trademark license agreements or certain other contractual arrangements at the sole discretion of the Company, for which the compensatory element of the arrangement is deducted from the accumulated profits.

Effective January 1, 2008, current CIT Law imposes a 10% withholding income tax for dividends distributed by foreign invested enterprises to their immediate holding companies outside mainland China. A lower withholding tax rate will be applied if there is a tax treaty arrangement between mainland China and the jurisdiction of the foreign holding company. Distributions to holding companies in Hong Kong that satisfy certain requirements specified by PRC tax authorities, for example, will be subject to a 5% withholding tax rate. Furthermore, pursuant to the applicable circular and interpretations of the current EIT Law, dividends from earnings created prior to 2008 but distributed after 2008 are not subject to withholding income tax.

Earnings/(loss) per share

In accordance with “Computation of Earnings Per Share”, basic earnings per share is computed by dividing net income attributable to common shareholders by the weighted average number of common shares outstanding during the year. Diluted earnings per share is calculated by dividing net income attributable to common shareholders as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the year. Dilutive ordinary equivalent shares consist of ordinary shares issuable upon the exercise of outstanding share options (using the treasury stock method). Vested but unexercised stock options with exercise prices that represent little or no consideration are included in the weighted average shares outstanding in the basic earnings per share calculation.

If the number of common shares outstanding increases as a result of a stock dividend or stock split or decreases as a result of a reverse stock split, the computations of basic and diluted EPS shall be adjusted retroactively for all periods presented to reflect that change in capital structure. If changes in common stock resulting from stock dividends, stock splits, or reverse stock splits occur after the close of the period but before the financial statements are issued or are available to be issued, the per-share computations for those and any prior-period financial statements presented shall be based on the new number of shares.

Effective December 1, 2015, the Company effected a change of the ratio of its American depositary shares (“ADSs”) to ordinary shares from four (4) ADSs representing one (1) ordinary share to eight (8) ADSs representing one (1) ordinary share. The historical and present earnings/ (loss) per share for the periods presented herein has been retrospectively adjusted to reflect such effect.

Treasury stock

In April, 2014, our board of directors approved a US$600 million share repurchase plan. The share-repurchase programs do not require the Company to acquire a specific number of shares and may be suspended or discontinued at any time.

Segment reporting

The Company operates and manages its business as a single segment. Resources are allocated and performance is assessed by the CEO, whom is determined to be the Chief Operating Decision Maker (CODM). Since the Company operates in one reportable segment, all financial segment and product information required by this statement can be found in the consolidated financial statements.

The Company primarily generates its revenues from end users in Great China Area, and assets of the Company are also primarily located in Great China Area. Accordingly, no geographical segments are presented.

Recent accounting pronouncements

In May 2014, the FASB issued a new accounting standard on the recognition of revenue from contracts with customers that was designed to create greater comparability for financial statement users across industries and jurisdictions. The core principle of this new standard is that an “entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” This new standard also requires enhanced disclosures on the nature, amount, timing and uncertainty of revenue from contracts with customers. Since May 2014, the FASB has issued several amendments to this new standard, including additional guidance, and deferred the effective date for public business entities to annual and interim periods beginning after December 15, 2017.

The Company will adopt this new standard effective January 1, 2018 and apply the full retrospective transition approach to all contracts, which means that the financial statements and footnotes of 2016 and 2017 will be retrospectively adjusted, along with that of 2018 will be reported under this new standard. The Company expects that the new standard will not change the presentation of substantially all of its revenues, which will continue to be reported on a net basis. However, the timing of revenue recognition for certain revenue streams will change under this new standard. For example, revenue for accommodation reservation services, which is primarily recognized after end users having completed their stays under the current standard, will change to be recognized once the reservation becomes non-cancellable, which is the point considered when the Company completes its performance obligation in accommodation reservation services. The Company expects that this timing change will not have a significant impact to its annual revenues and net income. Also, the adoption of the new standard will not impact the net cash provided by operating activities as presented in the Consolidated Statement of Cash Flows.

In January, 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. This accounting standard retains the current accounting for classifying and measuring investments in debt securities and loans, but requires equity investments to be measured at fair value with subsequent changes recognized in net income, except for those accounted for under the equity method or requiring consolidation. This guidance also changes the accounting for investments without a readily determinable fair value and that do not qualify for the practical expedient to estimate fair value. A policy election can be made for these investments whereby investment will be carried at cost and adjusted in subsequent periods for any impairment or changes in observable prices of identical or similar investments. This revised guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company will apply the new standard beginning January 1, 2018 and recognize the changes in fair value for all equity investments measured at fair value through net income/(loss). For investments in equity securities lacking of readily determinable fair values, the Company will elect to use the measurement alternative defined as cost, less impairments, adjusted by observable price changes. The Company anticipates that the adoption of ASU 2016-01 will increase the volatility of its other income (expense), net, as a result of the remeasurement of its equity securities upon the occurrence of observable price changes and impairments.

In February, 2016, the FASB issued ASU No. 2016-02, Leases. This accounting standard requires lessees to recognize assets and liabilities related to lease arrangements longer than 12 months on the balance sheet. This standard also requires additional disclosures by lessees and contains targeted changes to accounting by lessors. The updated guidance is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous GAAP. The Company is in the process of evaluating the impact of the standard on its consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326), Measurement of Credit Losses on Financial Statements. This ASU requires a financial asset (or group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The standard is effective for the Company from calendar 2020, with early adoption permitted for calendar 2019. The Company is evaluating the impact of the adoption of this standard on its consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments. This Update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. An entity that elects early adoption must adopt all of the amendments in the same period. The amendments in this Update should be applied using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company does not expect that the new standard will have a material impact on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-16, Income taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory, to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The amendments in this Update eliminate the exception for an intra-entity transfer of an asset other than inventory. The Update does not change GAAP for an intra-entity transfer of inventory. The amendments in this Update do not include new disclosure requirements; however, existing disclosure requirements might be applicable when accounting for the current and deferred income taxes for an intra-entity transfer of an asset other than inventory. For public business entities, the amendments in this Update are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. Early adoption is permitted for all entities as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued or made available for issuance. The amendments in this Update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company does not expect that the new standard will have a material impact on its consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash. The amendments in this Update require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The amendments in this Update do not provide a definition of restricted cash or restricted cash equivalents. The amendments in this Update are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The amendments in this Update should be applied using a retrospective transition method to each period presented. The Company does not expect that the new standard will have a material impact on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01: Business Combinations (Topic 805): Clarifying the Definition of a Business. The Update requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. If the screen is not met, the amendments in this Update (1) require that to be considered a business, a set must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output and (2) remove the evaluation of whether a market participant could replace missing elements. Public business entities should apply the amendments in this Update to annual periods beginning after December 15, 2017, including interim periods within those periods. Early application of the amendments in this Update is allowed. The amendments in this Update should be applied prospectively on or after the effective date. No disclosures are required at transition. The Company does not expect that the new standard will have a material impact on its consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04: Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. To simplify the subsequent measurement of goodwill, the Board eliminated Step 2 from the goodwill impairment test. Under the amendments in this Update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity should apply the amendments in this Update on a prospective basis. An entity is required to disclose the nature of and reason for the change in accounting principle upon transition. A public business entity that is a U.S. Securities and Exchange Commission (SEC) filer should adopt the amendments in this Update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is in the process of evaluating the impact of the Update on its consolidated financial statements.

Certain risks and concentration

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, short-term investment, accounts receivable, amounts due from related parties, prepayments and other current assets. As of December 31, 2015, 2016 and 2017, substantially all of the Company’s cash and cash equivalents, restricted cash and short-term investment were held in major financial institutions located in the PRC and in Hong Kong, which management considers to be of high credit quality based on their credit ratings. Accounts receivable are generally unsecured and denominated in RMB, and are derived from revenues earned from operations arising primarily in the PRC.

No individual customer accounted for more than 10% of net revenues for the years ended December 31, 2015, 2016 and 2017. No individual customer accounted for more than 10% of accounts receivable As of December 31, 2016 and 2017.

PREPAYMENTS AND OTHER CURRENT ASSETS

12 Months Ended

Dec. 31, 2017

PREPAYMENTS AND OTHER CURRENT ASSETS

PREPAYMENTS AND OTHER CURRENT ASSETS

3. PREPAYMENTS AND OTHER CURRENT ASSETS

Components of prepayments and other current assets as of December 31, 2016 and 2017 were as follows:

	2016	2017
	RMB	RMB
Prepayments and other deposits	5,082,058,275	4,575,682,047
Receivable from loans to the users	87,773,083	563,531,742
Prepaid expenses	439,983,044	424,602,556
Receivables from financial institution	207,182,863	96,066,261
Others	389,988,421	512,382,566

Total	6,206,985,686	6,172,265,172

LONG-TERM DEPOSITS AND PREPAYMENTS

12 Months Ended

Dec. 31, 2017

LONG-TERM DEPOSITS AND PREPAYMENTS

LONG-TERM DEPOSITS AND PREPAYMENTS

4. LONG-TERM DEPOSITS AND PREPAYMENTS

The Group’s subsidiaries and VIEs are required to pay certain amounts of deposit to airline companies and hotel suppliers. The subsidiaries and VIEs are also required to pay deposit to local travel bureau as pledge for insurance of traveler’s safety.

Components of long-term deposit and prepayments as of December 31, 2016 and 2017 were as follows:

	2016	2017
	RMB	RMB
Deposits paid to airline suppliers	244,072,331	276,128,171
Prepayments for purchase of long lived assets	625,084,070	241,378,538
Deposits paid to hotel suppliers	126,728,198	74,723,795
Others	151,394,598	247,689,752

Total	1,147,279,197	839,920,256

LONG-TERM LOAN RECEIVABLE	12 Months Ended
LONG-TERM LOAN RECEIVABLE	Dec. 31, 2017
LONG-TERM LOAN RECEIVABLE
LONG-TERM LOAN RECEIVABLE	5. LONG-TERM LOAN RECEIVABLE In April, 2015, the Company provided a 3-year loan to eHi Car Services Limited (“eHi”) for a total amount of RMB300 million. The annual interest rate of the loan is 6.9% and will be received at the end of every quarter. For the year ended December 2016, eHi repaid the loan with amount of RMB200 million. The remaining RMB100 million will be collected in 2018 and is classified as other current assets. Other long-term loan receivables as at December 31, 2016 and 2017 are not individually material.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

LAND USE RIGHTS	12 Months Ended
LAND USE RIGHTS	Dec. 31, 2017
LAND USE RIGHTS
LAND USE RIGHTS	6. LAND USE RIGHTS Land use rights are amortized under straight-line method through the respective period of land rights, which are from 40-50 years. Amortization expense for the years ended December 31, 2015, 2016 and 2017 was approximately RMB2 million, RMB3 million and RMB3 million, respectively. As of December 31, 2016 and 2017, the net book value was RMB100 million and RMB97 million respectively.

PROPERTY, EQUIPMENT AND SOFTWARE

12 Months Ended

Dec. 31, 2017

PROPERTY, EQUIPMENT AND SOFTWARE

PROPERTY, EQUIPMENT AND SOFTWARE

7. PROPERTY, EQUIPMENT AND SOFTWARE

Property, equipment and software and its related accumulated depreciation and amortization as of December 31, 2016 and 2017 were as follows:

	2016		2017
	RMB		RMB
Buildings	5,148,644,010		5,162,445,022
Computer equipment	731,530,644		926,427,543
Website-related equipment	536,705,335		637,528,902
Furniture and fixtures	178,703,320		232,846,204
Software	124,082,233		166,758,939
Leasehold improvements	115,997,785		140,221,796
Construction in progress	10,056,257		7,554,107
Less: accumulated depreciation and amortization	(1,253,759,503	)	(1,658,282,084	)

Total net book value	5,591,960,081		5,615,500,429

Depreciation expense for the years ended December 31, 2015, 2016 and 2017 was RMB256 million, RMB461 million and RMB490 million, respectively.

INVESTMENTS

12 Months Ended

Dec. 31, 2017

INVESTMENTS

INVESTMENTS

8. INVESTMENTS

The Company’s long-term investments are consisted of the follows:

	2016	2017
	RMB	RMB
Held to maturity investments	1,059,812,729	40,000,000
Available-for-sale investments	14,467,476,607	18,552,440,485
Equity method investments	4,114,199,782	6,068,391,137
Cost method investments	891,333,247	912,953,646

Total net book value	20,532,822,365	25,573,785,268

Held to maturity investments

Held to maturity investments were time deposits in commercial banks with maturities of more than one year. In 2015, the Company placed a three-year time deposit of RMB1 billion with fixed interest rate of 3.90% per annum. As of December 31, 2017, such time deposit was classified as short-term investment with its maturity being less than one year.

Available-for-sale investments

The following table summarizes, by major security type, the Company’s available-for-sale investments as of December 31, 2017:

	Cost, after adjusted with other-than-temporary impairment	Gross Unrealized Gains, including forex adjustment	Gross Unrealized Losses, including forex adjustment		Fair Value
	RMB	RMB	RMB		RMB
Listed equity securities	6,135,979,970	6,299,221,728	—		12,435,201,698
Unlisted debt securities	5,362,010,027	909,212,411	(153,983,651	)	6,117,238,787

Total Available-for-sale investments	11,497,989,997	7,208,434,139	(153,983,651	)	18,552,440,485

The following table summarizes, by major security type, the Company’s available-for-sale investments as of December 31, 2016:

	Cost, after adjusted with other-than-temporary impairment	Gross Unrealized Gains, including forex adjustment	Gross Unrealized Losses, including forex adjustment		Fair Value
	RMB	RMB	RMB		RMB
Listed equity securities	5,642,265,038	2,116,672,845	(97,057,486	)	7,661,880,397
Unlisted debt securities	6,263,538,336	572,369,972	(30,312,098	)	6,805,596,210

Total Available-for-sale investments	11,905,803,374	2,689,042,817	(127,369,584	)	14,467,476,607

For the years ended December 31, 2015, 2016 and 2017, the Company completed the following significant investments which were accounted for as available-for-sale investments:

In January, 2016, the Company invested US$180 million (approximately RMB1.2 billion) to purchase the convertible bonds of MakeMyTrip Limited (“MakeMyTrip”) which were subsequently converted to approximately 10% equity interest in MakeMyTrip in October 2016. As of December 31, 2016 and 2017, based on the market price, the Company re-measured the investment at a fair value of RMB1.5 billion and RMB2.1 billion respectively.

In April 2016, the Company purchased 3% equity interest of China Eastern Airlines with consideration of RMB3 billion. As of December 31, 2016 and 2017, based on the market price, the Company re-measured the investment at a fair value of RMB3.3 billion and RMB3.8 billion respectively.

As at December 31, 2016 and 2017, the fair value of available-for-sale investments that were in a loss position was RMB865 million and RMB3.4 billion, and none of which was in a loss position over twelve months.

For the years ended December 31, 2015, 2016 and 2017, the unrealized securities holding gain net of tax of RMB108 million, RMB(7) million and RMB305 million, respectively was reported in other comprehensive income. For the years ended December 31, 2015, 2016 and 2017, there was no tax effects in associated with the disposal of available-for-sale investments.

For the years ended December 31, 2015, 2016 and 2017, the total cash paid for available-for-sale securities was RMB0.1 billion, RMB4.2 billion and RMB1.1 billion, respectively.

Equity method investments

For the years ended December 31, 2015, 2016 and 2017, the Company completed the following investments which were accounted for as equity method investments:

In December 2016, in connection of share exchange transaction with BTG and Homeinns, the Company exchanged its previously held equity interest in Homeinns for 22% equity interest of BTG with a gain of RMB1.4 billion recognized and reported in “Equity in income/(loss) of affiliates” in the statement of income and comprehensive income. The Company applied equity method to account for the investment in BTG on one quarter lag basis. As of December 31, 2016 and 2017, the carrying value of its investment in Homeinns and BTG were RMB2.5 billion and RMB2.6 billion respectively.

Tujia used to be a subsidiary of the Company. ln 2015, after a private placement of Tujia, the Company lost the control in Tujia and a gain of RMB2.3 billion was recognized in the Other income/ (expense) (Note 2) in connection with the deconsolidation. ln 2017, the Company converted part of its preferred shares investment in Tujia to common shares with fair value of RMB1.7 billion. The Company applies equity method for its common shares on one quarter lag basis. The preferred shares investment in Tujia was continued to be accounted for as available-for- sale debt security. As of December 31, 2017, the carrying value of its equity method investment and fair value of its preferred shares were RMB1.5 billion and RMB1.7 billion respectively.

In May 2015, the Company acquired approximately 38% share capital of eLong, Inc. (“eLong”) and applied equity method on one quarter lag basis. In May 2016, eLong completed its “going-private” transaction and merger with E-dragon Holdings Limited (“E-dragon”) (“Reorganization”). After the Reorganization, the Company applies equity method for its ordinary shares investment in E-dragon’s on one quarter lag basis and the preferred shares of E-dragon are classified as available-for-sale debt security. As of December 31, 2017, the carrying value of its equity investment and fair value of preferred share investment in E-dragon were RMB194 million and RMB1.7 billion respectively. In December 2017, eLong announced a merger with LY.com and the merger was consummated in March 2018 and the Company received an equity method investment in the enlarged group.

As disclosed in Note 2 “Acquisition”, between October and December of 2015, the date of consolidation of Qunar, the Company accounted for the investment in Qunar under equity method and recognized the pick up loss of Qunar with amount of RMB2.4 billion. Subsequently on December 10, 2015, the date of the consolidation of Qunar, the Company recognized a RMB2.4 billion gain from the re-measurement of previously held equity interest of Qunar to its fair value and such gain was reported in same line item as which the equity pick-up of Qunar was presented.

In 2014, through a series of transactions, the Company and other shareholders, including Royal Caribbean Cruises Ltd. (“RCL”) formed Skysea Holding International Ltd. (“Skysea”) where the Company and RCL each owns 35% equity interest of Skysea. The Company and RCL also each provided a loan with amount of US$80 million to Skysea. The Company accounted for its investment in Skysea under equity method. The loan provided to Skysea was recorded in Long-term receivables due from related parties (Note 13). In March 2018, Ctrip and RCL agreed to wind down the business of Skysea by the end of 2018.

For the years ended December 31, 2015, 2016 and 2017, the Company made some investments in several third party investment funds. The Company accounted for these investments under equity methods on one quarter lag basis. As of December 31, 2016 and 2017, the carrying value of these investments were RMB616 million and RMB780 million respectively.

Other than Qunar in 2015 and eLong in 2016 respectively, all other equity method investments are not considered individually material. In 2017, all the equity method investments are not considered individually material. And in an aggregate basis, the Company summarizes the condensed financial information of the Company’s equity investments as a group below in accordance with Rule 4-08 of Regulation S-X.

	Year ended December 31,
	2015				2016				2017
	Qunar		Other equity investments		eLong		Other equity investments		Equity investments
Operating data:
Revenue	841,814,520		7,069,224,177		1,895,409,404		5,917,850,003		14,242,886,080
Gross profit	537,240,212		1,581,396,551		997,644,227		4,785,282,088		8,145,081,600
Income/(loss) from operations	(4,792,664,736	)	(20,961,158	)	(1,312,847,794	)	155,471,096		80,460,912
Net loss	(4,917,200,749	)	(189,461,030	)	(1,635,384,928	)	(62,190,299	)	(222,770,078	)
Net loss attributable to our equity method investments companies	(2,352,388,839	)	(127,465,948	)	(722,307,716	)	(55,314,772	)	(78,644,006	)
Add: Equity dilution impact	—		(8,314,364	)	(832,336	)	11,027,933		13,527,940
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equtiy investments in step acquisitions	2,352,388,839		—		—		1,369,310,070		—
Equity in income/(loss) of affiliates	—		(135,780,312	)	(723,140,052	)	1,325,023,231		(65,116,066	)

	As of December 31,
	2015		2016		2017
Balance sheet data:
Current assets	9,433,080,372	4,091,410,052	1,978,681,514	3,353,714,017	9,836,444,371
Long-term assets	1,072,464,782	10,102,034,376	454,710,971	17,298,415,142	16,552,821,327
Current liabilities	10,442,341,153	4,043,523,264	1,687,293,575	11,595,906,780	8,061,346,134
Long-term liabilities	93,019,969	466,730,372	15,970,032	1,650,938,946	6,191,180,525
Non-controlling interests	5,282,358	76,928,317	15,512,748	1,944,540,518	323,853,090

For the years ended December 31, 2015, 2016 and 2017, the total cash paid for equity method investments was RMB2.9 billion, RMB1.0 billion and RMB0.2 billion, respectively.

Cost method investment

For other equity investments that are not considered as debt securities or equity securities that have readily determinable fair values and over which the Company has neither significant influence nor control through investments in common stock or in-substance common stock, the cost method of accounting is used. The carrying value of cost method investments was RMB891 million and RMB913 million as of December 31, 2016 and 2017 respectively. None of the investments individually is considered as material to the Group’s financial position.

In 2016, the Company disposed certain cost method investments with total consideration of RMB317 million, which results a gain of RMB149 million as reported in other income.

In 2017, the Company disposed several cost method investments with total cash consideration of RMB1.4 billion which resulted in a gain of RMB1.4 billion as reported in other income (Note 2).

In 2015, 2016 and 2017, the Company made cost method investments with amount of RMB0.1 billion, RMB0.1 billion and RMB0.2 billion respectively.

Impairments

The Company performs impairment assessment of its investments by considering factors including, but not limited to, current economic and market conditions as well as the operating performance of the investees. Impairment charges in connection with the available-for-sale investments of nil, RMB36 million and RMB272 million were recorded for the years ended December 31, 2015, 2016 and 2017, respectively. Impairment charges in connection with the equity method investments of nil, nil and RMB64 million were recorded for the years ended December 31, 2015, 2016 and 2017, respectively. Impairment charges in connection with the cost method investments of nil, RMB12 million and RMB139 million were recorded for the years ended December 31, 2015, 2016 and 2017, respectively. The impairment were recorded in “Other income/ (expense)” (Note 2). The carrying value for the cost method and equity method impairments apply non-recurring fair value measures is nil for the years ended December 31, 2015, 2016 and 2017.

FAIR VALUE MEASUREMENT

12 Months Ended

Dec. 31, 2017

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT

9. FAIR VALUE MEASUREMENT

In accordance with ASC 820-10, the Company measures financial products, time deposits and available-for-sale investments at fair value on a recurring basis. Available-for-sale investments classified within Level 1 are valued using quoted market prices that currently available on a securities exchange registered with the Securities and Exchange Commission (SEC) and Shanghai Stock Exchange (SSE). Financial products and time deposits classified within Level 2 are valued using directly or indirectly observable inputs in the market place. The available-for-sale investments classified within Level 3 are valued based on a model utilizing unobservable inputs which require significant management judgment and estimation.

Assets measured at fair value on a recurring basis are summarized below:

	Fair Value Measurement at December 31, 2017 Using
	Quoted Prices in Active Market for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)	Unobservable inputs (Level 3)	Fair Value at December 31, 2017
	RMB	RMB	RMB	RMB	US$
Financial products	—	26,891,722,845	—	26,891,722,845	4,133,182,123
Time deposits	—	148,992,785	—	148,992,785	22,899,772
Available-for-sale investments
Listed equity securities	12,435,201,698	—	—	12,435,201,698	1,911,255,506
Unlisted debt securities	—	409,735,616	5,707,503,171	6,117,238,787	940,202,386

Total	12,435,201,698	27,450,451,246	5,707,503,171	45,593,156,115	7,007,539,787

	Fair Value Measurement at December 31, 2016 Using
	Quoted Prices in Active Market for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)	Unobservable inputs (Level 3)	Fair Value at December 31, 2016
	RMB	RMB	RMB	RMB	US$
Financial products	—	8,414,292,445	—	8,414,292,445	1,211,910,189
Time deposits	—	6,758,382,572	—	6,758,382,572	973,409,560
Available-for-sale investments
Listed equity securities	7,661,880,397	—	—	7,661,880,397	1,103,540,314
Unlisted debt securities	—	—	6,805,596,210	6,805,596,210	980,209,738

Total	7,661,880,397	15,172,675,017	6,805,596,210	29,640,151,624	4,269,069,801

The roll forward of major Level 3 investments are as following:

	Total
	RMB
Fair value of Level 3 investment as at December 31, 2015	5,466,103,304
Transfer in and/or out of Level 3	1,587,400,415
Disposal of investment	(317,261,674	)
Effect of exchange rate change	325,391,864
Other than temporary impairment	(36,357,902	)
The change in fair value of the investment	(219,679,797	)

Fair value of Level 3 investment as at December 31, 2016	6,805,596,210

Transfer in and/or out of Level 3	(1,755,271,349	)
New addition	455,441,000
Disposal of investment	(16,916,380	)
Effect of exchange rate change	(193,579,698	)
Other than temporary impairment	(155,500,570	)
The change in fair value of the investment	567,733,958

Fair value of Level 3 investment as at December 31, 2017	5,707,503,171

The Company determined the fair value of their investment by using income approach. The determination of the fair value was based on estimates, judgments and information of other comparable public companies. The significant unobservable inputs adopted in the valuation as of December 31, 2017 are as following:

Unobservable Input
Weighted average cost of capital		14.5%~17%
Lack of marketability discount		10%~15%
Risk-free rate		1.8%~3.5%
Expected volatility		32.94%~38%
Probability		Liquidation scenario: 20%~70% Redemption scenario: 20%~30% IPO scenario: 30%~60%
Dividend yield		Nil

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

GOODWILL

12 Months Ended

Dec. 31, 2017

GOODWILL

GOODWILL

10. GOODWILL

Goodwill, which is not tax deductible, represents the synergy effects of the business combinations. The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2017 were as follows:

	2016	2017
	RMB	RMB
Balance at beginning of year	45,690,440,903	56,015,185,590
Acquisition of Skyscanner (Note 2)	9,583,716,450	(59,685,731	)
Acquisition of Qunar (Note 2)	582,240,644	—
Others	158,787,593	290,551,433

Balance at end of period.	56,015,185,590	56,246,051,292

Goodwill resulting from the business combinations completed in the years ended December 31, 2017 has been allocated to the single reporting unit of the Group. For the years ended December 31, 2015, 2016 and 2017, the Company did not have goodwill impairment. As of December 31, 2017, there had not been any accumulated goodwill impairment provided.

INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2017

INTANGIBLE ASSETS

INTANGIBLE ASSETS

11. INTANGIBLE ASSETS

Intangible assets as of December 31, 2016 and 2017 were as follows:

	2016		2017
	RMB		RMB
Intangible asset
Intangible assets to be amortized
Business Relationship (Representing the relationship with the travel service providers and other business partners)	1,815,034,491		1,800,260,144
Technology	696,499,639		713,220,819
Others	131,629,465		187,739,465
Intangible assets not subject to amortization
Trade mark	11,613,475,256		11,613,475,256
Others	22,140,607		180,248,087

	14,278,779,458		14,494,943,771

Less: accumulated amortization
Intangible assets to be amortized
Business Relationship	(175,130,119	)	(420,311,754	)
Technology	(110,511,387	)	(229,246,477	)
Others	(68,368,021	)	(95,069,619	)

	(354,009,527	)	(744,627,850	)

Net book value
Intangible assets to be amortized
Business Relationship	1,639,904,372		1,379,948,390
Technology	585,988,252		483,974,342
Others	63,261,444		92,669,846
Intangible assets not subject to amortization
Trade mark	11,613,475,256		11,613,475,256
Others	22,140,607		180,248,087

	13,924,769,931		13,750,315,921

Finite-lived intangible assets are tested for impairment if impairment indicators arise. The Company amortizes its finite-lived intangible assets using the straight-line method:

Business Relationship		5-10 years
Technology		5-10 years
Others		3-10 years

Amortization expense for the years ended December 31, 2015, 2016 and 2017 was approximately RMB58 million, RMB255 million and RMB391 million respectively.

The annual estimated amortization expense for intangible assets subject to amortization for the five succeeding years is as follows:

		Amortization
		RMB

2018		396,364,608
2019		390,594,774
2020		374,512,943
2021		218,578,855
2022		174,564,565

		1,554,615,745

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT

12 Months Ended

Dec. 31, 2017

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT

12. SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT

	2016	2017
	RMB	RMB
Short-term bank borrowings	6,668,284,614	8,685,459,606
2020 Notes (Note 17)	—	4,554,403,494
2018 Notes (Note 17)	—	3,076,419,373
2017 Notes (Note 17)	170,867,230	—
Other short-term debt	48,157,745	—

Total	6,887,309,589	16,316,282,473

As of December 31, 2017, the Company obtained short-term bank borrowings of RMB8.7 billion (US$1.3 billion) in aggregate, of which RMB2.3 billion were collateralized by bank deposits of RMB595 million classified as restricted cash and/or short-term investment of RMB1.7 billion. The weighted average interest rate for the outstanding borrowings was approximately 3.92%.

The short-term borrowings contain covenants including, among others, limitation on liens, consolidation, merger and sale of the Company’s assets. The Company is in compliance with all of the loan covenants as of December 31, 2016 and 2017.

As of December 31, 2016 and 2017, RMB171 million of 2017 Notes and RMB3.1 billion of 2018 Notes is classified as short-term debt, respectively, to present that the Notes may be redeemed or mature within one year. As of December 31, 2017, RMB4.6 billion (US$700 million) of 2020 Notes was reclassified as short-term debt because the 2020 Notes holders had a non-contingent option to require the Company to repurchase for cash all or any portion of their 2020 Notes on July 1, 2018.

RELATED PARTY TRANSACTIONS AND BALANCES

12 Months Ended

Dec. 31, 2017

RELATED PARTY TRANSACTIONS AND BALANCES

13. RELATED PARTY TRANSACTIONS AND BALANCES

During the years ended December 31, 2015, 2016 and 2017 significant related party transactions were as follows:

	2015	2016	2017
	RMB	RMB	RMB
Commissions from eLong (a)	7,191,870	261,139,916	573,127,860
Commissions from Hanting (a)	17,740,390	44,094,542	76,792,041
Commissions from Homeinns and BTG (a)	34,556,539	66,921,837	62,528,564
Repayment of entrusted loan and interest from Baidu (b)	—	652,299,803	—
Shareholders’ loan and interest to Skysea (c)	15,826,363	73,399,675	4,346,586
Commissions to eLong (d)	9,532,316	85,780,819	243,783,254
Commissions to Baidu (d)	—	96,056,853	80,474,320
Commissions to LY.com (d)	75,297,659	62,150,144	70,208,452
Online marketing service from Baidu (e)	89,244,042	110,064,311	38,015,114
Repayment of entrusted loan and interest to Baidu (f)	—	1,837,384,234	—

(a)

BTG, Hanting and eLong, have entered into agreements with the Company, respectively, to provide hotel rooms for our customers. The transactions above represent the commissions earned from these related parties.

(b)

On October 27, 2015, Qunar granted a loan amounting to RMB650 million (US$100 million) to Baidu. The loan bore an interest at 1.00% with a repayment term of 12 months. Qunar received the repayment in March, 2016.

(c)

In 2014, the Company provided a shareholder’s loan of US$80 million to Skysea. The interest rate is 3% per annum currently and shall be subject to annual review and adjustment with mutual consent. The transactions above represent the interest of the loan. In 2017, the Company provided a provision for the loan and receivable to Skysea with amount of RMB536 million. See (b) below

(d)

The Company entered into agreements with elong, LY.com and Baidu, upon which these related parties promote the Company’s hotel rooms on their platforms. The transactions above represent the service commissions and Baidu Map business cooperation commission paid to these related parties.

(e)

The Company has entered into marketing service agreements with Baidu. The transactions above represent the marketing service fee paid to Baidu.

(f)

On March 12 and May 4, 2015, Qunar drew down RMB507 million and RMB627 million respectively pursuant to the revolving credit facility agreement with Baidu. In March 2016, Qunar repaid these loans and the facility agreement was terminated. In addition, on October 26, 2015, Qunar was granted a loan amounting to RMB640 million (US$99 million) from Baidu Times. The loan bore an interest at 4.14% with a repayment term of 12 months. Qunar repaid the loan in March, 2016.

As of December 31, 2016 and 2017, significant balances with related parties were as follows:

	2016	2017
	RMB	RMB
Due from related parties, current:
Due from eLong	132,381,883	152,825,748
Due from Baidu (a)	408,834,667	118,564,122
Due from LY.com	96,308,665	57,808,027
Due from Skysea (b)	132,035,460	—
Due from others	18,043,311	44,578,151

	787,603,986	373,776,048


Due from related parties, non-current:
Due from Skysea (b)	599,913,241	195,615,163
Due from others	—	22,738,196

	599,913,241	218,353,359


Due to related parties, current:
Due to eLong	506,461,015	273,480,768
Due to Baidu(a)	293,579,066	58,287,646
Due to others	37,381,264	86,732,455

	837,421,345	418,500,869

(a)

Qunar pays Baidu service commission at a percentage of gross revenue Qunar earns in exchange for the services provided by Baidu Maps. As of December 31, 2016 and December 31, 2017, the outstanding balance related to business cooperation agreement amounted to RMB409 million and RMB119 million respectively.

In 2015, Qunar obtained 3-year loan with amount of RMB1.1 billion from Baidu. In March 2016, Qunar repaid the loan. The repayment was reported in “Repayment of loans due to related parties” in the statement of cash flow.

In 2015, Qunar provided a 1-year loan amounting to RMB650 million (US$100 million) to Baidu. Qunar received the repayment in March 2016. In connection with the loan granted to Baidu, Qunar was granted a 1-year loan amounting to RMB640 million (US$99 million) from Baidu. Qunar repaid the loan in March 2016. The Company had evaluated both substance and form of these loans arrangements with Baidu. Given that the loan granted to Baidu is solely for the consideration the currency access to RMB and is also dependent on the receipt of the loan provided by Baidu, and also taking into account of the significant net cash in flow as a result of all the loans arrangements with Baidu during the periods, the Company believes these arrangements have the primary purpose and intent in common to finance Qunar and therefore are reported as financing activities in the statement of cash flow on a gross basis according to the forms of the arrangements.

(b)

In 2017, based on the impairment assessment by considering the operating results, market condition and business updates, a provision of RMB536 million for the loan and receivable balance due from Skysea was provided and a liability of RMB367 million for the contingent payable was recorded in “Other payables and accruals” (Note 16) which reflected the best estimates of the liability to be assume by the Company and offset by the proceeds from the net realisable value of Skysea in the event of winding down of its business, which is undergoing.

EMPLOYEE BENEFITS	12 Months Ended
EMPLOYEE BENEFITS	Dec. 31, 2017
EMPLOYEE BENEFITS
EMPLOYEE BENEFITS	14. EMPLOYEE BENEFITS The Group’s employee benefit primarily related to the full-time employees of the PRC subsidiaries and the VIEs, including medical care, welfare subsidies, housing fund, unemployment insurance and pension benefits. The PRC subsidiaries and VIEs are required to accrue for these benefits based on certain percentages of the employees’ salaries in accordance with the relevant PRC regulations and make contributions to the state-sponsored pension and medical plans out of the amounts accrued for medical and pension benefits. The PRC government is responsible for the medical benefits and ultimate pension liability to these employees. The total expenses recorded for such employee benefits amounted to RMB961 million, RMB1.4 billion and RMB1.6 billion for the years ended December 31, 2015, 2016 and 2017 respectively.

TAXATION

12 Months Ended

Dec. 31, 2017

TAXATION

TAXATION

15. TAXATION

Cayman Islands

Under the current laws of Cayman Islands, the Company is not subject to tax on income or capital gain. In addition, upon payments of dividends by the Company to its shareholders, no Cayman Islands withholding tax will be imposed.

Hong Kong

The Company’s subsidiaries incorporated in Hong Kong are subject to Hong Kong Profits Tax (“CIT”) on the taxable income as reported in their respective statutory financial statements adjusted in accordance with relevant Hong Kong tax laws. The applicable tax rate is 16.5% in Hong Kong.

Taiwan

The Company’s consolidated entities registered in Taiwan are subject to Taiwan Enterprise Income Tax on the taxable income as reported in their respective statutory financial statements adjusted in accordance with relevant Taiwan income tax laws. The applicable tax rate is 17% in Taiwan.

The PRC

The Company’s subsidiaries and VIEs registered in the PRC are subject to PRC Corporate Income Tax (“CIT”) on the taxable income as reported in their respective statutory financial statements adjusted in accordance with relevant PRC income tax laws.

The PRC CIT laws apply a general enterprise income tax rate of 25% to both foreign-invested enterprises and domestic enterprises. Preferential tax treatments are granted to enterprises, which conduct business in certain encouraged sectors and to enterprises otherwise classified as a High and New Technology Enterprise (“HNTE”). In 2017, Ctrip Computer Technology, Ctrip Travel Information and Ctrip Travel Network reapplied for their qualification as HNTE, which were approved by the relevant government authority. Thus, these subsidiaries are entitled to a preferential EIT rate of 15% from 2017 to 2020. Qunar Software and Qunar Beijing are also entitled a preferential EIT rate of 15% from 2015 to 2018.

In 2002, the State Taxation of Administration (“SAT”) started to implement preferential tax policy in China’s western regions, and companies located in applicable jurisdictions covered by the Western Regions Catalogue are eligible to apply for a preferential income tax rate of 15% if their businesses fall within the “encouraged” category of the policy. Over the years since 2012, Chengdu Ctrip and Chengdu Ctrip International obtained approval from local tax authorities to apply the 15% tax rate for their annual tax filing subject to periodic renewals. After the initial effective period expired in 2014, the two entities were approved by the relevant government authority to renew this qualification, which will expire in 2020. In 2013, Chengdu Information obtained approval from local tax authorities to apply the 15% tax rate for its 2012 tax filing and for the years from 2013 to 2020.

Pursuant to the PRC CIT Law, all foreign invested enterprises in the PRC are subject to the withholding tax for their earnings generated after January 1, 2008. The Company expects to indefinitely reinvest undistributed earnings generated after January 1, 2008 in the onshore PRC entities. As a result, no deferred tax liability was provided on the outside basis difference from undistributed earnings after January 1, 2008.

Income/(loss) from domestic and foreign components before income tax expenses

	2015	2016		2017
	RMB	RMB		RMB
Domestic	1,873,383,988	2,207,474,278		5,834,384,007
Foreign	1,131,979,994	(3,967,579,279	)	(2,327,889,321	)

Total	3,005,363,982	(1,760,105,001	)	3,506,494,686

The loss from foreign components mainly includes the share based compensation charge, impairment for investments, foreign exchange gain/(loss) and interest income/(loss) incurred in its overseas companies.

Composition of income tax expense

The current and deferred portion of income tax expense included in the consolidated statements of income for the years ended December 31, 2015, 2016 and 2017 were as follows:

	2015	2016	2017
	RMB	RMB	RMB
Current income tax expense	383,723,730	454,533,605	1,452,424,600
Deferred tax expense/(benefit)	86,464,693	23,475,428	(171,901,260	)

Income tax expense	470,188,423	478,009,033	1,280,523,340

Income tax expense was RMB1.3 billion (US$197 million) in the year ended December 31, 2017, increase from RMB478 million in the year ended 2016. The effective income tax rate in year ended December 31, 2017 was 37%, as compared to -27% in the year ended 2016, mainly due to profitability changes in our subsidiaries with different tax rates and the decrease of non-deductible share-based compensation expenses in 2017.

Reconciliation of the differences between statutory tax rate and the effective tax rate

The reconciliation between the statutory CIT rate and the Group’s effective tax rate for the years ended December 31, 2015, 2016 and 2017 were as follows:

	2015		2016		2017
Statutory CIT rate	25	%	25	%	25	%
Tax differential from statutory rate applicable to subsidiaries with preferential tax rates	(5	)%	8	%	6	%
Gain on deconsolidation of a subsidiary with a withholding tax rate of 10% versus the statutory CIT rate	(11	)%	—		—
Non-deductible expenses and non-taxable income incurred	6	%	(50	)%	4	%
Change in valuation allowance	1	%	(10	)%	2	%

Effective CIT rate	16	%	(27	)%	37	%

The change in the Group’s effective tax rates from year over year is primarily attributable to the tax differential from certain subsidiaries with preferential tax rates as well as the non-deductible expenses.

The non-deductible expenses are primarily attributable to the share based compensation charge of RMB643 million, RMB3.6 billion and RMB1.8 billion for the year ended December 31, 2015, 2016 and 2017, respectively, which was not deductible according to the PRC tax laws. For the years ended December 31, 2015, 2016 and 2017, such non-deductible expense increased the income tax in the amount of RMB161 million, RMB890 million and RMB458 million, respectively by using enacted tax rate of 25%, which led to the increase of effective tax rate of 5%, -51% and 13% respectively. The remaining impact from the non-deductible expenses comes from the other expenses incurred on the Company level which is also not subject to income tax.

The provisions for income taxes for the years ended December 31, 2015, 2016 and 2017 differ from the amounts computed by applying the CIT primarily due to preferential tax rate enjoyed by certain subsidiaries and VIEs of the Company as well as the gain on deconsolidation of a subsidiary which was subject to a lower withholding tax rate of 10%. The following table sets forth the effect of preferential tax on China operations:

	2015	2016	2017
	RMB	RMB	RMB
Tax holiday effect	162,896,542	177,799,057	345,292,589
Basic net income per ADS effect	1.08	0.38	0.65
Diluted net income per ADS effect	0.86	0.38	0.60

For the years ended December 31, 2015, 2016 and 2017, the impacts on effective tax rates from the Company’s major subsidiaries with preferential tax rates are as follows:

	Impact on the effective tax rates
			2015		2016		2017
Ctrip Computer Technology (Shanghai) Co., Ltd.	15	%	(1.4	)%	4.2	%	(1.6	)%
Ctrip Travel Information Technology (Shanghai) Co., Ltd.	15	%	(0.4	)%	1.9	%	(1.6	)%
Ctrip Travel Network Technology (Shanghai) Co., Ltd.	15	%	(3.0	)%	7.4	%	(1.6	)%
Chengdu Information Technology Co., Ltd.	15	%	(0.6	)%	1.4	%	(2.1	)%
The Company and its subsidiaries in Hong Kong and	16.5	%,
Cayman	0	%	(0.3	)%	0.8	%	15.4	%
Qunar and subsidiaries	15	%	—		(5.9	)%	(1.0	)%
Others	16.5%, 15%, 0	%	0.40	%	(1.6	)%	(1.1	)%
Total			(5.3	)%	8.2	%	6.4	%

Significant components of deferred tax assets and liabilities:

	2016		2017
	RMB		RMB
Accrued expenses	149,205,615		331,524,551
Loss carry forward	159,747,175		150,575,892
Accrued liability for customer reward related programs	122,635,196		99,188,976
Accrued staff salary	55,228,349		4,018,972
Others	38,782,032		73,875,163
Less: Valuation allowance of deferred tax assets	(150,286,773	)	(197,214,279	)

Total deferred tax assets	375,311,594		461,969,275


Deferred tax liabilities:
Recognition of intangible assets arise from business combinations and unrealized holding gain	(3,607,882,808	)	(3,847,440,251	)


Net deferred tax assets/(liabilities)	(3,232,571,214	)	(3,385,470,976	)

Movement of valuation allowances:

	2015		2016	2017
	RMB		RMB	RMB
Balance at beginning of year	183,449,500		31,489,450	150,286,773
Current year additions	31,590,648		118,797,323	46,927,506
Deconsolidation of Tujia	(183,550,698	)	—	—

Balance at end of year	31,489,450		150,286,773	197,214,279

As of December 31, 2016 and 2017, valuation allowance of RMB150 million and RMB197 million was mainly provided for operating loss carry forwards related to certain subsidiaries based on then assessment where it is more likely than not that such deferred tax assets will not be realized. If events were to occur in the future that would allow us to realize more of our deferred tax assets than the presently recorded net amount, an adjustment would be made to the deferred tax assets that would increase income for the period when those events occurred.

As of December 31, 2017, the Group had net operating tax loss carry forwards amounted to RMB662 million which will expire from 2018 to 2021 if not used.

As of December 31, 2016 and 2017, the unrecognized tax benefit and accrual is nil.

Qunar, one of the Company’s subsidiaries acts as an agent for its air travel facilitating services including aviation insurance policies (the “Aviation Insurance Arrangements”), presents revenues from such transactions on a net basis. Under the current PRC CIT Laws and regulations, Qunar’s existing business arrangement more likely than not will subject Qunar to income taxes on a gross basis for the Aviation Insurance Arrangements. The difference between the net revenue and the gross revenue is considered as deemed revenue for additional income taxes. The associated income tax expense is calculated by applying the applicable tax rate to the deemed revenue amount and includes the late payment interest based on the applicable tax rules. Such liabilities primarily represent the tax provision made with respect to the deemed revenue from these transactions. It is possible that the amount accrued will change in the next 12 months, however, an estimate of the range of the possible change cannot be made at this time.

OTHER PAYABLES AND ACCRUALS

12 Months Ended

Dec. 31, 2017

OTHER PAYABLES AND ACCRUALS

OTHER PAYABLES AND ACCRUALS

16. OTHER PAYABLES AND ACCRUALS

Components of other payables and accruals As of December 31, 2016 and 2017 were as follows:

	2016	2017
	RMB	RMB
Accrued operating expenses	1,549,809,298	2,851,988,186
Deposits received from suppliers and packaged-tour users	460,648,199	507,158,340
Payable for acquisition and investments (Note 2)	157,004,868	625,682,289
Provision related to an equity method investment (Note 13)	—	367,448,156
Due to employees for stock option proceeds received on their behalf	250,831,976	197,430,857
Deposit for special bonus program (a)	168,404,481	178,771,740
Interest payable	103,016,365	68,413,048
Accruals for property and equipment	22,855,856	42,444,370
Deferred revenue	12,664,375	31,789,775
Others	124,585,829	225,509,712

Total	2,849,821,247	5,096,636,473

(a)

In September, 2014, the Company established a special bonus program. Under this program, the Company provides the bonus units to the selected employees and the employees are required to provide deposit to participate such program. The bonus is calculated based on certain agreed-upon performance merits and is paid together with the deposit. As of December 31, 2017, the Company recognized the employees deposit of RMB179 million in other payable. The expenses recognized for the bonus program were not significant in 2015, 2016 and 2017.

LONG-TERM DEBT

12 Months Ended

Dec. 31, 2017

LONG-TERM DEBT

LONG-TERM DEBT

17.LONG-TERM DEBT

	2016		2017
	RMB		RMB
2018 Notes	5,554,400,000		—
2020 Notes	4,860,100,000		—
2025 Notes	2,777,200,000		2,602,520,000
2022 Notes	6,769,425,000		6,343,642,500
2019 Priceline Notes	3,471,500,000		3,253,150,000
2020 Priceline Notes	1,735,750,000		1,626,575,000
2025 Priceline and Hillhouse Notes	6,943,000,000		6,506,300,000
2022 Priceline Notes	173,575,000		162,657,500
Long-term loan	2,550,000,000		8,807,156,482
Less: Debt issuance cost	(184,276,447	)	(81,746,715	)

Total	34,650,673,553		29,220,254,767

As of December 31, 2017, the fair value of the Company’s long-term debt, based on Level 2 inputs, was RMB29.3 billion.

Description of 2017 Convertible Senior Notes

On September 24, 2012, the Company issued US$180 million in aggregate principle amount of 0.5% Convertible Senior Notes due 2017 (the “2017 Notes”). The 2017 Notes may be converted, at each holder’s option, at an initial conversion rate of 51.7116 American depository shares (“ADSs”) per US$1,000 principal amount of the 2017 Notes (which represents an initial conversion price of US$19.34 per ADS at any time prior to the close of business on the second business day immediately preceding the maturity date of September 15, 2017. Debt issuance costs were US$5.4 million and are being amortized to interest expense to the put date of the 2017 Notes (September 15, 2015).

Concurrently with the issuance of the 2017 Notes, the Company purchased a call option (“2012 Purchased Call Option”) and sold warrants (“2012 Sold Warrants”), where the counterparty agreed to sell to the Company up to approximately 9.3 million of the Company’s ADSs at a price of US$19.34 per ADS upon the Company’s exercise of the 2012 Purchased Call Option and the Company received US$26.6 million from the same counterparty for the sale of warrants to purchase up to approximately 9.3 million of the Company’s ADSs at an exercise price of US$ 26.37 per ADS.

As of December 31, 2017, all 2017 Notes have been converted.

Description of 2018 Convertible Senior Notes

On October 17, 2013, the Company issued US$800 million in aggregate principle amount of 1.25% Convertible Senior Notes due 2018 (the “2018 Notes”). The 2018 Notes may be converted, at an initial conversion rate of 12.7568 ADSs per US$1,000 principal amount of the 2018 Notes (which represents an initial conversion price of US$78.39 per ADS) at any time prior to the close of business on the second business day immediately preceding the maturity date of October 15, 2018. Debt issuance costs were US$19.6 million and are being amortized to interest expense to the put date of the 2018 Notes (October 15, 2016).

Absent a fundamental change (as defined in the indenture for the 2018 Notes), each holder of the 2018 Notes has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2018 Notes on October 15, 2016. As a result of this option the 2018 Notes were classified as current liability as at December 31, 2015. The holders did not exercise that option and it expired and the 2018 Notes were reclassified to non-current liability as at December 31, 2016 as they do not mature until 2018. The Company believes that the likelihood of occurrence of events considered a fundamental change is remote. The 2018 Notes are not redeemable prior to the maturity date of October 15, 2018.

Concurrently with the issuance of the 2018 Notes, the Company purchased a call option (“2013 Purchased Call Option”) and sold warrants (“2013 Sold Warrants”) where the counterparty agreed to sell to the Company up to approximately 10.2 million of the Company’s ADSs at a price of US$ 78.39 per ADS upon the Company’s exercise of the 2013 Purchased Call Option and the Company received US$77.2 million from the same counterparty for the sale of warrants to purchase up to approximately 10.2 million of the Company’s ADSs at an exercise price of US$96.27 per ADS.

In June 2017, the Company exchanged approximately US$327 million aggregate principal amount of the outstanding 2018 Notes for (i) approximately 8.3 million of our ADSs based on a conversion price of approximately US$39.19 per ADS computed pursuant to the indenture of the 2018 Notes. The conversion price has reflected the share split of the Company effective from December 1, 2015.

The Company offered inducements to the holders of the 2017 and 2018 Notes for early conversion. As a result, for the years ended December 31, 2016 and 2017, US$26 million and US$352 million of the 2017 and 2018 Notes were early converted to 2.6 million and 10.8 million ADSs respectively, at the initial conversion rate of the 2017 and 2018 Notes. Such early conversion also resulted in an early termination of the 2012 and 2013 Purchased Call Option, from which the Company has received US$12 million and US$100 million (RMB650 million) in 2016 and 2017 respectively.

Description of 2020 Convertible Senior Notes

On June 18, 2015, the Company issued US$700 million of 1.00% Convertible Senior Notes due 2020 (the “2020 Notes”). The 2020 Notes may be converted at an initial conversion rate of 9.1942 ADSs per US$1,000 principal amount of the 2020 Notes (which represents an initial conversion price of US$108.76 per ADS) at any time prior to the close of business on the second business day immediately preceding the maturity date of July 1, 2020. Debt issuance costs were US$11.3 million and are being amortized to interest expense to the put date of the 2020 Notes (July 1, 2018).

Absent a fundamental change (as defined in the indenture for the 2020 Notes), each holder of the 2020 Notes has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2020 Notes on July 1, 2018. The Company believes that the likelihood of occurrence of events considered a fundamental change is remote. The 2020 Notes are not redeemable prior to the maturity date of July 1, 2020.

Concurrently with the issuance of the 2020 Notes, the Company purchased a call option (“2015 Purchased Call Option”) and sold warrants (“2015 Sold Warrants”) where the counterparty agreed to sell to the Company up to approximately 6.4 million of the Company’s ADSs upon the Company’s exercise of the 2015 Purchased Call Option and the Company received US$84.4 million from the same counterparty for the sale of warrants to purchase up to approximately 6.4 million of the Company’s ADSs.

Description of 2025 Convertible Senior Notes

On June 18, 2015, the Company issued US$400 million of 1.99% Convertible Senior Notes due 2025 (the “2025 Notes”). The 2025 Notes may be converted, at an initial conversion rate of 9.3555 ADSs per US$1,000 principal amount of the 2025 Notes (which represents an initial conversion price of US$106.89 per ADS), at each holder’s option at any time prior to the close of business on the second business day immediately preceding the maturity date of July 1, 2025. Debt issuance costs were US$6.8 million and are being amortized to interest expense to the put date of the 2025 Notes (July 1, 2020).

Absent a fundamental change (as defined in the indenture for the 2025 Notes), each holder of the 2025 Notes has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2025 Notes on July 1, 2020. If a fundamental change (as defined in the indenture for the 2025 Notes) occurs at any time, each holder has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2025 Notes on the date notified in writing by the Company in accordance with the indenture for the 2025 Notes. The Company believes that the likelihood of occurrence of events considered a fundamental change is remote. The 2025 Notes are generally not redeemable prior to the maturity date of July 1, 2025, except that the Company may, at its option, redeem all but not part of the 2025 Notes in accordance with the indenture for the 2025 Notes if the Company has or will become obligated to pay holders additional amount due to certain changes in tax law of the relevant jurisdiction.

Description of 2022 Convertible Senior Notes

On September 12, 2016 and September 19, 2016, the Company issued US$975 million of 1.25% Convertible Senior Notes due 2022 (the “2022 Notes”). The 2022 Notes may be converted, at an initial conversion rate of 15.2688 ADSs per US$1,000 principal amount of the 2022 Notes (which represents an initial conversion price of US$65.49 per ADS) at each holder’s option at any time prior to the close of business on the business day immediately preceding the maturity date of September 15, 2022. Debt issuance costs were US$19 million and are being amortized to interest expense to the put date of the 2022 Notes (September 15, 2019).

Absent a fundamental change (as defined in the indenture for the 2022 Notes), each holder of the 2022 Notes has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2022 Notes on September 15, 2019. If a fundamental change (as defined in the indenture for the 2022 Notes) occurs at any time, each holder has a right at such holder’s option to require the Company to repurchase for cash all or any portion of such holder’s 2022 Notes on the date notified in writing by the Company in accordance with the indenture for the 2022 Notes. The Company believes that the likelihood of occurrence of events considered a fundamental change is remote. The 2022 Notes are generally not redeemable prior to the maturity date of September 15, 2022, except that the Company may, at its option, redeem all but not part of the 2022 Notes in accordance with the indenture for the 2022 Notes if the Company has or will become obligated to pay holders additional amount due to certain changes in tax law of the relevant jurisdiction.

The Company assessed the 2017 Notes, 2018 Notes, 2020 Notes, 2025 Notes and 2022 Notes (collectively as “Notes”), the 2012 Purchased Call Option, 2013 Purchased Call Option and 2015 Purchased Call Option (the “Purchased Call Options”), and the 2012 Sold Warrants, 2013 Sold Warrants and 2015 Sold Warrants (the “Sold Warrants”) under ASC 815 and concluded that:

The Notes, the Purchased Call Options and the Sold Warrants (1) do not entail the same risks; and (2) have a valid business purpose and economic need for structuring the transactions separately. Therefore, the offering of the Notes, the Purchased Call Options and Sold Warrants transactions should be accounted separately;

The repurchase option is considered clearly and closely related to its debt host and does not meet the requirement for bifurcation;

Since the conversion option is considered indexed to the Company’s own stock, bifurcation of conversion option from the Notes is not required as the scope exception prescribed in ASC 815-10-15-74 is met;

There was no BCF attribute to the Notes as the set conversion prices for the Notes were greater than the respective fair values of the ordinary share price at date of issuances;

Therefore, the Company has accounted for the respective Notes as a single instruments as a long-term debt. The debt issuance cost were recorded as reduction to the long-term debts and are amortised as interest expenses using the effective interest method. The value of the Notes are measured by the cash received. The Purchased Call Options and Sold Warrants are accounted for within stockholders’ equity.

Description of Priceline and Hillhouse Notes

On August 7, 2014, the Company issued Convertible Senior Note (the “2019 Priceline Note”) at an aggregate principal amount of US$500 million to an indirect subsidiary of the Priceline Group. The Priceline 2019 Note is due on August 7, 2019 and bears interest of 1% per annum, which will be paid semi-annually beginning on February 7, 2015. The Priceline 2019 Note will be convertible into the Company’s ADSs with an initial conversion price of approximately US$81.36 per ADS.

On May 26, 2015, the Company issued Convertible Senior Note (the “2020 Priceline Note”) at an aggregate principal amount of US$250 million to an indirect subsidiary of the Priceline Group. The Priceline 2020 Note is due on May 29, 2020 and bears interest of 1% per annum, which will be paid semi-annually beginning on November 29, 2015. The Priceline 2020 Note will be convertible into the Company’s ADSs with an initial conversion price of approximately US$104.27 per ADS.

On December 10, 2015, the Company issued Convertible Senior Notes at an aggregate principal amount of US$1 billion to an indirect subsidiary of the Priceline Group and two affiliates of Hillhouse (the “2025 Priceline and Hillhouse Notes”). The 2025 Priceline and Hillhouse Notes are due on December 11, 2025 and bear interest of 2% per annum, which will be paid semi-annually beginning on June 11, 2016. The 2025 Priceline and Hillhouse Notes will be convertible into the Company’s ADSs with an initial conversion price of approximately US$68.46 per ADS.

On September 12, 2016, the Company issued US$25 million Convertible Senior Note to an indirect subsidiary of the Priceline Group (the “2022 Priceline Note”). The 2022 Priceline Note is due on September 15, 2022 and bears interest of 1.25% per annum, which will be paid semi-annually beginning on March 15, 2017. The 2022 Priceline Note will be convertible into the Company’s ADSs with an initial conversion price of approximately US$65.49 per ADS.

The Company has accounted for the above notes as a single instrument. The value of the above notes is measured by the cash received. The Company recorded the interest expenses according to its annual interest rate. There was no BCF attribute to the above notes as the set conversion price for the above notes was greater than the fair value of the ADS price at date of issuance.

Long-term Loans from Commercial Banks

As of December 31, 2017, the Company obtained long-term borrowings of RMB8.8 billion (US$1.4 billion) in aggregate collateralized by bank deposits, properties and/or stock at one or more of our wholly-owned subsidiaries. The interest rate for the outstanding borrowings was approximately from 1.9% to 7.0%.

CAPITAL AND TREASURY STOCK	12 Months Ended
CAPITAL AND TREASURY STOCK	Dec. 31, 2017
CAPITAL AND TREASURY STOCK
CAPITAL AND TREASURY STOCK	18. CAPITAL AND TREASURY STOCK In 2015, 2016 and 2017, US$16.5 million, US$21.6 million and US$19.6 million convertible senior notes were early converted and 244,466 shares, 330,048 shares and 318,170 shares of repurchased treasury stock were delivered to the notes holders, respectively. As of December 31, 2017, the Company had 2,929,139 shares treasury stock at total cost of US$324 million. In September 2016, the Company completed the public offering of an aggregate of 32,775,000 ADSs, or the 2016 ADS Offering, including 4,275,000 ADSs in connection with the underwriters’ exercise of over-allotment option for an aggregate offering price of approximately US$1.5 billion. Concurrently with the 2016 ADS Offering, the Company issued ordinary shares with the respective subsidiaries of Baidu, Inc., or Baidu, and Priceline Group Inc., or Priceline at an aggregate investment amount of US$100 million and US$25 million, respectively. The issuance cost incurred for the above offerings with amount of RMB226 million was presented as reduction to the offering proceeds.

EARNINGS/(LOSSES) PER SHARE

12 Months Ended

Dec. 31, 2017

EARNINGS/(LOSSES) PER SHARE

EARNINGS/(LOSSES) PER SHARE

19. EARNINGS/(LOSSES) PER SHARE

Basic earnings/(loss) per share and diluted earnings per share were calculated as follows:

	2015	2016		2017
	RMB	RMB		RMB
Numerator:
Net income/(loss) attributable to Ctrip’s shareholders	2,507,655,884	(1,430,703,195	)	2,142,011,537
Eliminate the dilutive effect of interest expense of convertible notes	185,589,773	—		52,229,311

Numerator for diluted earnings/(loss) per share	2,693,245,657	(1,430,703,195	)	2,194,240,848


Denominator:
Denominator for basic earnings/(loss) per ordinary share
- weighted average ordinary shares outstanding	37,797,698	59,166,582		66,300,808
Dilutive effect of share options	2,962,481	—		2,978,969
Dilutive effect of convertible notes	6,102,417	—		2,345,083
Dilutive effect of convertible notes sold warrants	512,652	—		151,033

Denominator for diluted earnings/(loss) per ordinary share	47,375,248	59,166,582		71,775,893


Basic earnings/(loss) per ordinary share	66.34	(24.18	)	32.31

Diluted earnings/(loss) per ordinary share	56.85	(24.18	)	30.57


Basic earnings/(loss) per ADS	8.29	(3.02	)	4.04

Diluted earnings/(loss) per ADS	7.11	(3.02	)	3.82

The 2018, 2020, 2025 and 2022 Notes, the 2025 Priceline and Hillhouse Notes and 2022 Priceline Notes were not included in the computation of diluted EPS in 2017 because the inclusion of such instrument would be anti-dilutive. All the convertible senior notes had anti-dilutive impact and were excluded in the computation of diluted EPS in 2016, given the loss reported. The 2025 Notes and the 2025 Priceline and Hillhouse Notes were not included in the computation of diluted EPS in 2015 because the inclusion of such instrument would be anti-dilutive.

For the years ended December 31, 2015, 2016 and 2017, the Company had securities which could potentially dilute basic earnings per share in the future, which were excluded from the computation of diluted earnings/(loss) per share as their effects would have been anti-dilutive. Such weighted average numbers of ordinary shares outstanding are as following:

	2015	2016	2017
	RMB	RMB	RMB

2017 Notes	—	435,248	—
2018 Notes	—	2,551,360	2,002,507
2020 Notes	—	1,608,985	1,608,984
2025 Notes	486,999	935,550	935,550
2022 Notes	—	559,282	1,860,885
2019 Priceline Notes	—	1,536,338	—
2020 Priceline Notes	—	599,400	—
2025 Priceline and Hillhouse Notes	100,046	1,825,838	1,825,838
2022 Priceline Notes	—	14,341	47,715
Outstanding weighted average stock options	64,074	3,678,030	99,695
Sold Warrants	1,734,865	303,176	—

	2,385,984	14,047,548	8,381,174

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2017

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

20. COMMITMENTS AND CONTINGENCIES

Operating lease commitments

The Company has entered into leasing arrangements relating to office premises that are classified as operating leases for the periods from 2018 to 2022. Future minimum lease payments for non-cancelable operating leases are as follows:

		Office Premises
		RMB
2018		263,400,004
2019		188,973,971
2020		98,682,126
2021		66,924,998
2022		53,406,162
Thereafter		178,218,196

		849,605,457

Rental expense amounted to RMB134 million, RMB378 million and RMB445 million for the years ended December 31, 2015, 2016 and 2017, respectively. Rental expense is charged to the statements of income and comprehensive income when incurred.

Capital commitments

As of December 31, 2017, the Company had outstanding capital commitments totaling RMB49 million, which consisted of capital expenditures of property, equipment and software.

Deposit under guarantee arrangement

In connection with our air ticketing business, the Group is required by an affiliate of Civil Aviation Administration of China (“CAAC”) and International Air Transport Association (“IATA”) to enter into guarantee arrangements and to pay deposits. The unused deposits are repaid at the end of the guaranteed period on an annual basis. As of December 31, 2017, the total quota of the air tickets that the Company was entitled to issue was up to RMB1.1 billion. The total amount of the deposit the Company paid was RMB133 million.

Based on the guarantee arrangements and historical experience, the maximum amount of the future payments of Company is approximately RMB931 million which is the guaranteed amount of the air ticket that the Company could issue rather than a financial guarantee. The Company will be liable to pay only when it issues the air tickets to its users and such payable is included in the accounts payable. Therefore, the Company believes the guarantee arrangements do not constitute any contractual and constructive obligation of the Company and has not recorded any liability beyond the amount of the tickets that have already been issued.

Contingencies

The Company is not currently a party to any pending material litigation or other legal proceeding or claims.

The Company is incorporated in Cayman Islands and is considered as a foreign entity under PRC laws. Due to the restrictions on foreign ownership of the air-ticketing, travel agency, advertising and internet content provision businesses, the Company conducts these businesses partly through various VIEs. These VIEs hold the licenses and approvals that are essential for the Company’s business operations. In the opinion of the Company’s PRC legal counsel, the current ownership structures and the contractual arrangements with these VIEs and their shareholders as well as the operations of these VIEs are in compliance with all existing PRC laws, rules and regulations. However, there may be changes and other developments in PRC laws and regulations. Accordingly, the Company cannot be assured that PRC government authorities will not take a view in the future contrary to the opinion of the Company’s PRC legal counsel. If the current ownership structures of the Company and its contractual arrangements with VIEs were found to be in violation of any existing or future PRC laws or regulations, the Company may be required to restructure its ownership structure and operations in China to comply with changing and new Chinese laws and regulations.

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2017
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	21. SUBSEQUENT EVENTS The Company has evaluated the subsequent events through the date of these financial statements.

PRINCIPAL ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2017

PRINCIPAL ACCOUNTING POLICIES

Basis of presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”).

Consolidation

The following is a summary of the Company’s major VIEs and VIEs’ subsidiaries:

Name of VIE and VIEs’ subsidiaries		Date of establishment/acquisition

Shanghai Ctrip Commerce Co., Ltd. (“Shanghai Ctrip Commerce”)		Established on July 18, 2000
Shanghai Huacheng Southwest International Travel Agency Co., Ltd. (“Shanghai Huacheng”, formerly known as Shanghai Huacheng Southwest Travel Agency Co., Ltd.)		Established on March 13, 2001
Chengdu Ctrip Travel Agency Co., Ltd. (“Chengdu Ctrip”)		Established on January 8, 2007
Beijing Qu Na Information Technology Company Limited (“Qunar Beijing”)		Established on March 17, 2006

Major variable interest entities and their subsidiaries

Details of certain key agreements with the VIEs are as follows:

Risks in relation to contractual arrangements between the Company’s PRC subsidiaries and its affiliated Chinese entities:

Summary financial information of the Group’s VIEs in the consolidated financial statements

	As of December 31,
	2016		2017
	RMB		RMB
Total assets	30,544,580,876		21,755,512,736
Less: Inter-company receivables	(2,050,819,348	)	(1,569,895,648	)

Total assets excluding inter-company	28,493,761,528		20,185,617,088

Total liabilities	29,101,732,239		19,282,345,546

Less: Inter-company payables	(15,904,065,265	)	(12,114,432,077	)

Total liabilities excluding inter-company	13,197,666,974		7,167,913,469

The following table set forth the summary of results of operations of the VIEs and their subsidiaries of the Company:

	For the year ended December 31,
	2015		2016	2017
	RMB		RMB	RMB
Net revenues	6,384,556,234		8,706,139,377	8,237,250,837
Cost of revenues	1,983,511,461		2,442,997,433	2,489,892,564
Net income / (loss)	(73,523,163	)	100,653,423	863,231,207

The amount of service fees paid by all the VIEs as a percentage of the VIEs’ total net income were 107.1%, 96.3% and 68.3% for the years ended December 31, 2015, 2016 and 2017, respectively.

The following tables set forth the summary of cash flow activities of the VIEs and their subsidiaries of the Company:

	For the year ended December 31,
	2015	2016	2017
	RMB	RMB	RMB
Net cash provided by operating activities	160,298,446	7,190,925,721	1,232,432,873
Net cash used in investing activities	—	—	—
Net cash provided by financing activities	—	—	—

Foreign currencies

Cash and cash equivalents

Restricted cash

Short-term investments

Loan receivable

Land use rights

Property, equipment and software

Building		30-40 years
Leasehold improvements		Lesser of the term of the lease or the estimated useful lives of the assets
Website-related equipment		5 years
Computer equipment		3-5 years
Furniture and fixtures		3-5 years
Software		3-5 years

The Company recognizes the disposal of Property, equipment and software in general and administrative expenses.

Investments

The Company’s investments include equity method investments, cost method investments, available-for-sale investments and held to maturity investments.

The investments that the Company has positive intent and ability to hold to maturity are classified as held-to-maturity investments and are stated at amortized cost.

Fair value measurement of financial instruments

The Company measures its financial assets and liabilities using inputs from the following three levels of the fair value hierarchy. The three levels are as follows:

Level 1 inputs are unadjusted quoted prices in active markets for identical assets that the management has the ability to access at the measurement date.

Business combination and Acquisitions

Business combination

Acquisitions

Skyscanner Holdings Limited (“Skyscanner”)

Qunar Cayman Islands Limited (“Qunar”)

Below is the summary of the fair value of acquisition cost for these acquisitions:

	RMB	US$
Fair value of previously held equity interest (1)	21,698,582,100	3,416,184,974
Consideration paid in December 2015	10,842,783,275	1,687,067,570

Total purchase cost	32,541,365,375	5,103,252,544

(1)

Which represents fair value of purchase consideration for the initial equity method investment in October 2015

In thousands	2015
	RMB
Pro-forma net revenues	14,812,533
Pro-forma net loss	(5,086,934	)

Goodwill and other intangible assets

The Company reviews intangible assets with indefinite lives annually for impairment.

No impairment on other intangible assets was recognized for the years ended December 31, 2015, 2016 and 2017.

Impairment of long-lived assets

Accrued liability for customer reward program

Deferred revenue

Revenue recognition

Accommodation reservation services

Transportation ticketing services

Packaged-tour

Corporate travel

Other businesses

Other businesses comprise primarily of online advertising services.

Allowance for doubtful accounts

	2015		2016		2017
	RMB		RMB		RMB
Balance at beginning of year	14,707,184		38,237,658		58,841,826
Provision for doubtful accounts	32,080,786		32,339,617		97,944,278
Write-offs	(8,550,312	)	(11,735,449	)	(28,064,747	)

Balance at end of period	38,237,658		58,841,826		128,721,357

Cost of revenues

Product development

Sales and marketing

Share-based compensation

Share incentive plans

A summary of option activity under the share incentive plans

The following table summarized the Company’s share option activity under all the option plans, which has reflected the effect of the Exchange of Qunar Share Incentive Plans (in US$, except shares):

	Number of Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2014	4,972,178		101.03	5.17	405,399,251

Granted	625,006		247.91
Exercised	(506,163)		65.65
Forfeited	(85,560)		156.32

Outstanding at December 31, 2015	5,005,461		122.00	4.77	1,244,544,670

Granted	937,002		322.20
Exercised	(368,722	)	80.70
Forfeited	(41,226	)	199.32

Outstanding at December 31, 2016	5,532,515		157.82	4.54	899,966,907

Granted (including grants in exchange for Qunar options )	631,166		43.03
Exercised	(1,353,697	)	68.95
Forfeited	(99,226	)	133.92

Outstanding at December 31, 2017	4,710,758		168.80	4.72	866,781,417

Vested and expect to vest at December 31, 2017	4,570,018		167.40	4.67	847,267,373

Exercisable at December 31, 2017	2,951,517		141.77	3.78	622,855,872

The Company’s current practice is to issue new shares to satisfy share option exercises.

The expected-to-vest options are the result of applying the pre-vesting forfeiture rate assumptions of 8% to total unvested options.

The total intrinsic value of options exercised during the years ended December 31, 2015, 2016 and 2017 were US$178 million, US$257 million and US$522 million, respectively.

The following table summarizes information related to outstanding and exercisable options as of December 31, 2017 (in US$, except shares):

	Outstanding			Exercisable
Range of Exercise Prices	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)
0.00-100.00	1,671,410	61.24	3.90	1,306,991	78.31	2.93
100.01-200.00	1,460,228	155.54	3.84	1,128,628	151.22	3.67
200.01-300.00	664,262	253.65	5.72	299,221	250.70	5.69
300.01-400.00	914,858	324.87	6.88	216,677	324.92	6.87

	4,710,758			2,951,517

The weighted average fair value of options granted during the years ended December 31, 2015, 2016 and 2017 was US$109.93, US$140.95 and US$376.78 per share, respectively.

	2015	2016	2017
Risk-free interest rate	1.35%-1.59%	1.16%-1.66%	1.73%-1.94%
Expected life (years)	5.0	5.0	5.0
Expected dividend yield	0%	0%	0%
Volatility	49%-50%	48%-51%	46%-48%
Fair value of options at grant date per share	from US$105.16	from US$133.85	from US$142.29
	to US$112.76	to US$141.72	to US$430.87

For the years ended December 31, 2015, 2016 and 2017, the Company granted 229,603, 1,183,094 and 15,664 RSUs to employees with 4 year requisite service period, respectively.

The following table summarized the Company’s RSUs activities under all incentive plans (in US$, except shares):

			Weighted
			average grant
	Number of		date fair
	Shares		value(US$)
Restricted shares
Unvested at December 31, 2014	1,058,608		158.55

Granted	229,603		249.31
Vested	(271,683	)	129.21
Forfeited	(151,120	)	181.47

Unvested at December 31, 2015	865,408		185.17

Granted	1,183,094		301.62
Vested	(492,825	)	223.00
Forfeited	(93,438	)	237.69

Unvested at December 31, 2016	1,462,239		263.28

Granted	15,664		323.92
Vested	(285,375	)	191.21
Forfeited	(96,806	)	274.71

Unvested at December 31, 2017	1,095,722		281.91

Operating leases

Taxation

Other income/ (expense)

	2015		2016		2017
	RMB		RMB		RMB
Gain on disposal of cost method investment (Note 8)	—		149,066,258		1,374,462,407
Foreign exchange gains/(losses)	12,638,982		(557,995,284	)	468,671,832
Subsidy income	199,418,778		220,631,285		263,538,347
Gain on disposal of available-for-sale investment (Note 8)	—		140,651,759		39,951,298
Dividends from long-term investment	—		48,911,066		46,550,230
Gain on disposal of a subsidiary	—		—		11,412,387
Gain on deconsolidation of subsidiaries	2,294,451,702		252,000		—
Impairments of cost method investments	—		(11,628,980	)	(139,271,481	)
Impairments of available-for-sale investments	—		(36,357,902	)	(271,707,804	)
Provision/impairment for an equity method investment (Note 8 and Note 13)	—		—		(967,395,005	)
Others	(25,529,632	)	19,621,511		52,785,926

Total	2,480,979,830		(26,848,287	)	878,998,137

Statutory reserves

Dividends

Dividends are recognized when declared.

Earnings/(loss) per share

Treasury stock

Segment reporting

Recent accounting pronouncements

Certain risks and concentration

PRINCIPAL ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Acquisitions disclosures

Summary of Company's major VIEs and VIE's subsidiaries

Name of VIE and VIEs’ subsidiaries		Date of establishment/acquisition

Shanghai Ctrip Commerce Co., Ltd. (“Shanghai Ctrip Commerce”)		Established on July 18, 2000
Shanghai Huacheng Southwest International Travel Agency Co., Ltd. (“Shanghai Huacheng”, formerly known as Shanghai Huacheng Southwest Travel Agency Co., Ltd.)		Established on March 13, 2001
Chengdu Ctrip Travel Agency Co., Ltd. (“Chengdu Ctrip”)		Established on January 8, 2007
Beijing Qu Na Information Technology Company Limited (“Qunar Beijing”)		Established on March 17, 2006

Summary of consolidated balance sheet information of VIEs

	As of December 31,
	2016		2017
	RMB		RMB
Total assets	30,544,580,876		21,755,512,736
Less: Inter-company receivables	(2,050,819,348	)	(1,569,895,648	)

Total assets excluding inter-company	28,493,761,528		20,185,617,088

Total liabilities	29,101,732,239		19,282,345,546

Less: Inter-company payables	(15,904,065,265	)	(12,114,432,077	)

Total liabilities excluding inter-company	13,197,666,974		7,167,913,469

Summary of consolidated results of operations information of VIEs

	For the year ended December 31,
	2015		2016	2017
	RMB		RMB	RMB
Net revenues	6,384,556,234		8,706,139,377	8,237,250,837
Cost of revenues	1,983,511,461		2,442,997,433	2,489,892,564
Net income / (loss)	(73,523,163	)	100,653,423	863,231,207

Summary of consolidated results of cash flows information of VIEs

	For the year ended December 31,
	2015	2016	2017
	RMB	RMB	RMB
Net cash provided by operating activities	160,298,446	7,190,925,721	1,232,432,873
Net cash used in investing activities	—	—	—
Net cash provided by financing activities	—	—	—

Schedule of property, equipment and software estimated useful lives

Building		30-40 years
Leasehold improvements		Lesser of the term of the lease or the estimated useful lives of the assets
Website-related equipment		5 years
Computer equipment		3-5 years
Furniture and fixtures		3-5 years
Software		3-5 years

Allowance for doubtful accounts

	2015		2016		2017
	RMB		RMB		RMB
Balance at beginning of year	14,707,184		38,237,658		58,841,826
Provision for doubtful accounts	32,080,786		32,339,617		97,944,278
Write-offs	(8,550,312	)	(11,735,449	)	(28,064,747	)

Balance at end of period	38,237,658		58,841,826		128,721,357

Company's share option activity under all the incentive plans

The following table summarized the Company’s share option activity under all the option plans, which has reflected the effect of the Exchange of Qunar Share Incentive Plans (in US$, except shares):

	Number of Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2014	4,972,178		101.03	5.17	405,399,251

Granted	625,006		247.91
Exercised	(506,163)		65.65
Forfeited	(85,560)		156.32

Outstanding at December 31, 2015	5,005,461		122.00	4.77	1,244,544,670

Granted	937,002		322.20
Exercised	(368,722	)	80.70
Forfeited	(41,226	)	199.32

Outstanding at December 31, 2016	5,532,515		157.82	4.54	899,966,907

Granted (including grants in exchange for Qunar options )	631,166		43.03
Exercised	(1,353,697	)	68.95
Forfeited	(99,226	)	133.92

Outstanding at December 31, 2017	4,710,758		168.80	4.72	866,781,417

Vested and expect to vest at December 31, 2017	4,570,018		167.40	4.67	847,267,373

Exercisable at December 31, 2017	2,951,517		141.77	3.78	622,855,872

The following table summarizes information related to outstanding and exercisable options as of December 31, 2017 (in US$, except shares):

	Outstanding			Exercisable
Range of Exercise Prices	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)	Number of shares	Weighted-Average Exercise Price	Weighted-average Remaining Contractual Life (Years)
0.00-100.00	1,671,410	61.24	3.90	1,306,991	78.31	2.93
100.01-200.00	1,460,228	155.54	3.84	1,128,628	151.22	3.67
200.01-300.00	664,262	253.65	5.72	299,221	250.70	5.69
300.01-400.00	914,858	324.87	6.88	216,677	324.92	6.87

	4,710,758			2,951,517

Assumptions of Black-Scholes pricing model

	2015	2016	2017
Risk-free interest rate	1.35%-1.59%	1.16%-1.66%	1.73%-1.94%
Expected life (years)	5.0	5.0	5.0
Expected dividend yield	0%	0%	0%
Volatility	49%-50%	48%-51%	46%-48%
Fair value of options at grant date per share	from US$105.16	from US$133.85	from US$142.29
	to US$112.76	to US$141.72	to US$430.87

Schedule of restricted share activities under all incentive plans

The following table summarized the Company’s RSUs activities under all incentive plans (in US$, except shares):

			Weighted
			average grant
	Number of		date fair
	Shares		value(US$)
Restricted shares
Unvested at December 31, 2014	1,058,608		158.55

Granted	229,603		249.31
Vested	(271,683	)	129.21
Forfeited	(151,120	)	181.47

Unvested at December 31, 2015	865,408		185.17

Granted	1,183,094		301.62
Vested	(492,825	)	223.00
Forfeited	(93,438	)	237.69

Unvested at December 31, 2016	1,462,239		263.28

Granted	15,664		323.92
Vested	(285,375	)	191.21
Forfeited	(96,806	)	274.71

Unvested at December 31, 2017	1,095,722		281.91

Summary of components of other income

	2015		2016		2017
	RMB		RMB		RMB
Gain on disposal of cost method investment (Note 8)	—		149,066,258		1,374,462,407
Foreign exchange gains/(losses)	12,638,982		(557,995,284	)	468,671,832
Subsidy income	199,418,778		220,631,285		263,538,347
Gain on disposal of available-for-sale investment (Note 8)	—		140,651,759		39,951,298
Dividends from long-term investment	—		48,911,066		46,550,230
Gain on disposal of a subsidiary	—		—		11,412,387
Gain on deconsolidation of subsidiaries	2,294,451,702		252,000		—
Impairments of cost method investments	—		(11,628,980	)	(139,271,481	)
Impairments of available-for-sale investments	—		(36,357,902	)	(271,707,804	)
Provision/impairment for an equity method investment (Note 8 and Note 13)	—		—		(967,395,005	)
Others	(25,529,632	)	19,621,511		52,785,926

Total	2,480,979,830		(26,848,287	)	878,998,137

Qunar

Acquisitions disclosures

Summary of fair value of acquisition cost

	RMB	US$
Fair value of previously held equity interest (1)	21,698,582,100	3,416,184,974
Consideration paid in December 2015	10,842,783,275	1,687,067,570

Total purchase cost	32,541,365,375	5,103,252,544

(1)

Which represents fair value of purchase consideration for the initial equity method investment in October 2015

Schedule of pro forma results

In thousands	2015
	RMB
Pro-forma net revenues	14,812,533
Pro-forma net loss	(5,086,934	)

PREPAYMENTS AND OTHER CURRENT ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

PREPAYMENTS AND OTHER CURRENT ASSETS

Components of prepayments and other current assets

	2016	2017
	RMB	RMB
Prepayments and other deposits	5,082,058,275	4,575,682,047
Receivable from loans to the users	87,773,083	563,531,742
Prepaid expenses	439,983,044	424,602,556
Receivables from financial institution	207,182,863	96,066,261
Others	389,988,421	512,382,566

Total	6,206,985,686	6,172,265,172

LONG-TERM DEPOSITS AND PREPAYMENTS (Tables)

12 Months Ended

Dec. 31, 2017

LONG-TERM DEPOSITS AND PREPAYMENTS

Components of long-term deposits and prepayments

	2016	2017
	RMB	RMB
Deposits paid to airline suppliers	244,072,331	276,128,171
Prepayments for purchase of long lived assets	625,084,070	241,378,538
Deposits paid to hotel suppliers	126,728,198	74,723,795
Others	151,394,598	247,689,752

Total	1,147,279,197	839,920,256

PROPERTY, EQUIPMENT AND SOFTWARE (Tables)

12 Months Ended

Dec. 31, 2017

PROPERTY, EQUIPMENT AND SOFTWARE

Schedule of property, equipment and software and its related accumulated depreciation and amortization

	2016		2017
	RMB		RMB
Buildings	5,148,644,010		5,162,445,022
Computer equipment	731,530,644		926,427,543
Website-related equipment	536,705,335		637,528,902
Furniture and fixtures	178,703,320		232,846,204
Software	124,082,233		166,758,939
Leasehold improvements	115,997,785		140,221,796
Construction in progress	10,056,257		7,554,107
Less: accumulated depreciation and amortization	(1,253,759,503	)	(1,658,282,084	)

Total net book value	5,591,960,081		5,615,500,429

INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2017

INVESTMENTS

Schedule of long-term investments

	2016	2017
	RMB	RMB
Held to maturity investments	1,059,812,729	40,000,000
Available-for-sale investments	14,467,476,607	18,552,440,485
Equity method investments	4,114,199,782	6,068,391,137
Cost method investments	891,333,247	912,953,646

Total net book value	20,532,822,365	25,573,785,268

Summary of available-for sale investments by major security type

The following table summarizes, by major security type, the Company’s available-for-sale investments as of December 31, 2017:

	Cost, after adjusted with other-than-temporary impairment	Gross Unrealized Gains, including forex adjustment	Gross Unrealized Losses, including forex adjustment		Fair Value
	RMB	RMB	RMB		RMB
Listed equity securities	6,135,979,970	6,299,221,728	—		12,435,201,698
Unlisted debt securities	5,362,010,027	909,212,411	(153,983,651	)	6,117,238,787

Total Available-for-sale investments	11,497,989,997	7,208,434,139	(153,983,651	)	18,552,440,485

The following table summarizes, by major security type, the Company’s available-for-sale investments as of December 31, 2016:

	Cost, after adjusted with other-than-temporary impairment	Gross Unrealized Gains, including forex adjustment	Gross Unrealized Losses, including forex adjustment		Fair Value
	RMB	RMB	RMB		RMB
Listed equity securities	5,642,265,038	2,116,672,845	(97,057,486	)	7,661,880,397
Unlisted debt securities	6,263,538,336	572,369,972	(30,312,098	)	6,805,596,210

Total Available-for-sale investments	11,905,803,374	2,689,042,817	(127,369,584	)	14,467,476,607

Schedule of financial information of investees

	Year ended December 31,
	2015				2016				2017
	Qunar		Other equity investments		eLong		Other equity investments		Equity investments
Operating data:
Revenue	841,814,520		7,069,224,177		1,895,409,404		5,917,850,003		14,242,886,080
Gross profit	537,240,212		1,581,396,551		997,644,227		4,785,282,088		8,145,081,600
Income/(loss) from operations	(4,792,664,736	)	(20,961,158	)	(1,312,847,794	)	155,471,096		80,460,912
Net loss	(4,917,200,749	)	(189,461,030	)	(1,635,384,928	)	(62,190,299	)	(222,770,078	)
Net loss attributable to our equity method investments companies	(2,352,388,839	)	(127,465,948	)	(722,307,716	)	(55,314,772	)	(78,644,006	)
Add: Equity dilution impact	—		(8,314,364	)	(832,336	)	11,027,933		13,527,940
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equtiy investments in step acquisitions	2,352,388,839		—		—		1,369,310,070		—
Equity in income/(loss) of affiliates	—		(135,780,312	)	(723,140,052	)	1,325,023,231		(65,116,066	)

	As of December 31,
	2015		2016		2017
Balance sheet data:
Current assets	9,433,080,372	4,091,410,052	1,978,681,514	3,353,714,017	9,836,444,371
Long-term assets	1,072,464,782	10,102,034,376	454,710,971	17,298,415,142	16,552,821,327
Current liabilities	10,442,341,153	4,043,523,264	1,687,293,575	11,595,906,780	8,061,346,134
Long-term liabilities	93,019,969	466,730,372	15,970,032	1,650,938,946	6,191,180,525
Non-controlling interests	5,282,358	76,928,317	15,512,748	1,944,540,518	323,853,090

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE MEASUREMENT

Schedule of fair value assets measured on recurring basis

	Fair Value Measurement at December 31, 2017 Using
	Quoted Prices in Active Market for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)	Unobservable inputs (Level 3)	Fair Value at December 31, 2017
	RMB	RMB	RMB	RMB	US$
Financial products	—	26,891,722,845	—	26,891,722,845	4,133,182,123
Time deposits	—	148,992,785	—	148,992,785	22,899,772
Available-for-sale investments
Listed equity securities	12,435,201,698	—	—	12,435,201,698	1,911,255,506
Unlisted debt securities	—	409,735,616	5,707,503,171	6,117,238,787	940,202,386

Total	12,435,201,698	27,450,451,246	5,707,503,171	45,593,156,115	7,007,539,787

	Fair Value Measurement at December 31, 2016 Using
	Quoted Prices in Active Market for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)	Unobservable inputs (Level 3)	Fair Value at December 31, 2016
	RMB	RMB	RMB	RMB	US$
Financial products	—	8,414,292,445	—	8,414,292,445	1,211,910,189
Time deposits	—	6,758,382,572	—	6,758,382,572	973,409,560
Available-for-sale investments
Listed equity securities	7,661,880,397	—	—	7,661,880,397	1,103,540,314
Unlisted debt securities	—	—	6,805,596,210	6,805,596,210	980,209,738

Total	7,661,880,397	15,172,675,017	6,805,596,210	29,640,151,624	4,269,069,801

Schedule of roll forward of major Level 3 investments

	Total
	RMB
Fair value of Level 3 investment as at December 31, 2015	5,466,103,304
Transfer in and/or out of Level 3	1,587,400,415
Disposal of investment	(317,261,674	)
Effect of exchange rate change	325,391,864
Other than temporary impairment	(36,357,902	)
The change in fair value of the investment	(219,679,797	)

Fair value of Level 3 investment as at December 31, 2016	6,805,596,210

Transfer in and/or out of Level 3	(1,755,271,349	)
New addition	455,441,000
Disposal of investment	(16,916,380	)
Effect of exchange rate change	(193,579,698	)
Other than temporary impairment	(155,500,570	)
The change in fair value of the investment	567,733,958

Fair value of Level 3 investment as at December 31, 2017	5,707,503,171

Schedule of significant unobservable inputs adopted in the valuation

Unobservable Input
Weighted average cost of capital		14.5%~17%
Lack of marketability discount		10%~15%
Risk-free rate		1.8%~3.5%
Expected volatility		32.94%~38%
Probability		Liquidation scenario: 20%~70% Redemption scenario: 20%~30% IPO scenario: 30%~60%
Dividend yield		Nil

GOODWILL (Tables)

12 Months Ended

Dec. 31, 2017

GOODWILL

Schedule of changes in the carrying amount of goodwill

	2016	2017
	RMB	RMB
Balance at beginning of year	45,690,440,903	56,015,185,590
Acquisition of Skyscanner (Note 2)	9,583,716,450	(59,685,731	)
Acquisition of Qunar (Note 2)	582,240,644	—
Others	158,787,593	290,551,433

Balance at end of period.	56,015,185,590	56,246,051,292

INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

INTANGIBLE ASSETS

Schedule of intangible assets

	2016		2017
	RMB		RMB
Intangible asset
Intangible assets to be amortized
Business Relationship (Representing the relationship with the travel service providers and other business partners)	1,815,034,491		1,800,260,144
Technology	696,499,639		713,220,819
Others	131,629,465		187,739,465
Intangible assets not subject to amortization
Trade mark	11,613,475,256		11,613,475,256
Others	22,140,607		180,248,087

	14,278,779,458		14,494,943,771

Less: accumulated amortization
Intangible assets to be amortized
Business Relationship	(175,130,119	)	(420,311,754	)
Technology	(110,511,387	)	(229,246,477	)
Others	(68,368,021	)	(95,069,619	)

	(354,009,527	)	(744,627,850	)

Net book value
Intangible assets to be amortized
Business Relationship	1,639,904,372		1,379,948,390
Technology	585,988,252		483,974,342
Others	63,261,444		92,669,846
Intangible assets not subject to amortization
Trade mark	11,613,475,256		11,613,475,256
Others	22,140,607		180,248,087

	13,924,769,931		13,750,315,921

Schedule of useful lives of finite-lived intangible assets

Business Relationship		5-10 years
Technology		5-10 years
Others		3-10 years

Schedule of future estimated amortization expense finite-lived intangible assets

		Amortization
		RMB

2018		396,364,608
2019		390,594,774
2020		374,512,943
2021		218,578,855
2022		174,564,565

		1,554,615,745

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2017

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT

Summary of short-term debt

	2016	2017
	RMB	RMB
Short-term bank borrowings	6,668,284,614	8,685,459,606
2020 Notes (Note 17)	—	4,554,403,494
2018 Notes (Note 17)	—	3,076,419,373
2017 Notes (Note 17)	170,867,230	—
Other short-term debt	48,157,745	—

Total	6,887,309,589	16,316,282,473

RELATED PARTY TRANSACTIONS AND BALANCES (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of related party transactions

	2015	2016	2017
	RMB	RMB	RMB
Commissions from eLong (a)	7,191,870	261,139,916	573,127,860
Commissions from Hanting (a)	17,740,390	44,094,542	76,792,041
Commissions from Homeinns and BTG (a)	34,556,539	66,921,837	62,528,564
Repayment of entrusted loan and interest from Baidu (b)	—	652,299,803	—
Shareholders’ loan and interest to Skysea (c)	15,826,363	73,399,675	4,346,586
Commissions to eLong (d)	9,532,316	85,780,819	243,783,254
Commissions to Baidu (d)	—	96,056,853	80,474,320
Commissions to LY.com (d)	75,297,659	62,150,144	70,208,452
Online marketing service from Baidu (e)	89,244,042	110,064,311	38,015,114
Repayment of entrusted loan and interest to Baidu (f)	—	1,837,384,234	—

(a)

(b)

(c)

(d)

(e)

The Company has entered into marketing service agreements with Baidu. The transactions above represent the marketing service fee paid to Baidu.

(f)

Schedule of significant balances with related parties

	2016	2017
	RMB	RMB
Due from related parties, current:
Due from eLong	132,381,883	152,825,748
Due from Baidu (a)	408,834,667	118,564,122
Due from LY.com	96,308,665	57,808,027
Due from Skysea (b)	132,035,460	—
Due from others	18,043,311	44,578,151

	787,603,986	373,776,048


Due from related parties, non-current:
Due from Skysea (b)	599,913,241	195,615,163
Due from others	—	22,738,196

	599,913,241	218,353,359


Due to related parties, current:
Due to eLong	506,461,015	273,480,768
Due to Baidu(a)	293,579,066	58,287,646
Due to others	37,381,264	86,732,455

	837,421,345	418,500,869

(a)

(b)

TAXATION (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of income/(loss) from domestic and foreign components before income tax expenses

	2015	2016		2017
	RMB	RMB		RMB
Domestic	1,873,383,988	2,207,474,278		5,834,384,007
Foreign	1,131,979,994	(3,967,579,279	)	(2,327,889,321	)

Total	3,005,363,982	(1,760,105,001	)	3,506,494,686

Schedule of composition of income tax expense

	2015	2016	2017
	RMB	RMB	RMB
Current income tax expense	383,723,730	454,533,605	1,452,424,600
Deferred tax expense/(benefit)	86,464,693	23,475,428	(171,901,260	)

Income tax expense	470,188,423	478,009,033	1,280,523,340

Schedule of reconciliation of the differences between statutory tax rate and the effective tax rate

	2015		2016		2017
Statutory CIT rate	25	%	25	%	25	%
Tax differential from statutory rate applicable to subsidiaries with preferential tax rates	(5	)%	8	%	6	%
Gain on deconsolidation of a subsidiary with a withholding tax rate of 10% versus the statutory CIT rate	(11	)%	—		—
Non-deductible expenses and non-taxable income incurred	6	%	(50	)%	4	%
Change in valuation allowance	1	%	(10	)%	2	%

Effective CIT rate	16	%	(27	)%	37	%

Schedule of effect of preferential tax on China operations

	2015	2016	2017
	RMB	RMB	RMB
Tax holiday effect	162,896,542	177,799,057	345,292,589
Basic net income per ADS effect	1.08	0.38	0.65
Diluted net income per ADS effect	0.86	0.38	0.60

Schedule of significant components of deferred tax assets and liabilities

	2016		2017
	RMB		RMB
Accrued expenses	149,205,615		331,524,551
Loss carry forward	159,747,175		150,575,892
Accrued liability for customer reward related programs	122,635,196		99,188,976
Accrued staff salary	55,228,349		4,018,972
Others	38,782,032		73,875,163
Less: Valuation allowance of deferred tax assets	(150,286,773	)	(197,214,279	)

Total deferred tax assets	375,311,594		461,969,275


Deferred tax liabilities:
Recognition of intangible assets arise from business combinations and unrealized holding gain	(3,607,882,808	)	(3,847,440,251	)


Net deferred tax assets/(liabilities)	(3,232,571,214	)	(3,385,470,976	)

Schedule of movement of valuation allowances

	2015		2016	2017
	RMB		RMB	RMB
Balance at beginning of year	183,449,500		31,489,450	150,286,773
Current year additions	31,590,648		118,797,323	46,927,506
Deconsolidation of Tujia	(183,550,698	)	—	—

Balance at end of year	31,489,450		150,286,773	197,214,279

Subsidiaries

Schedule of reconciliation of the differences between statutory tax rate and the effective tax rate

	Impact on the effective tax rates
			2015		2016		2017
Ctrip Computer Technology (Shanghai) Co., Ltd.	15	%	(1.4	)%	4.2	%	(1.6	)%
Ctrip Travel Information Technology (Shanghai) Co., Ltd.	15	%	(0.4	)%	1.9	%	(1.6	)%
Ctrip Travel Network Technology (Shanghai) Co., Ltd.	15	%	(3.0	)%	7.4	%	(1.6	)%
Chengdu Information Technology Co., Ltd.	15	%	(0.6	)%	1.4	%	(2.1	)%
The Company and its subsidiaries in Hong Kong and	16.5	%,
Cayman	0	%	(0.3	)%	0.8	%	15.4	%
Qunar and subsidiaries	15	%	—		(5.9	)%	(1.0	)%
Others	16.5%, 15%, 0	%	0.40	%	(1.6	)%	(1.1	)%
Total			(5.3	)%	8.2	%	6.4	%

OTHER PAYABLES AND ACCRUALS (Tables)

12 Months Ended

Dec. 31, 2017

OTHER PAYABLES AND ACCRUALS

Schedule of other payables and accruals

	2016	2017
	RMB	RMB
Accrued operating expenses	1,549,809,298	2,851,988,186
Deposits received from suppliers and packaged-tour users	460,648,199	507,158,340
Payable for acquisition and investments (Note 2)	157,004,868	625,682,289
Provision related to an equity method investment (Note 13)	—	367,448,156
Due to employees for stock option proceeds received on their behalf	250,831,976	197,430,857
Deposit for special bonus program (a)	168,404,481	178,771,740
Interest payable	103,016,365	68,413,048
Accruals for property and equipment	22,855,856	42,444,370
Deferred revenue	12,664,375	31,789,775
Others	124,585,829	225,509,712

Total	2,849,821,247	5,096,636,473

(a)

LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2017

LONG-TERM DEBT

Schedule of convertible senior notes

	2016		2017
	RMB		RMB
2018 Notes	5,554,400,000		—
2020 Notes	4,860,100,000		—
2025 Notes	2,777,200,000		2,602,520,000
2022 Notes	6,769,425,000		6,343,642,500
2019 Priceline Notes	3,471,500,000		3,253,150,000
2020 Priceline Notes	1,735,750,000		1,626,575,000
2025 Priceline and Hillhouse Notes	6,943,000,000		6,506,300,000
2022 Priceline Notes	173,575,000		162,657,500
Long-term loan	2,550,000,000		8,807,156,482
Less: Debt issuance cost	(184,276,447	)	(81,746,715	)

Total	34,650,673,553		29,220,254,767

EARNINGS/(LOSSES) PER SHARE (Tables)

12 Months Ended

Dec. 31, 2017

EARNINGS/(LOSSES) PER SHARE

Schedule of basic earnings/(loss) per share and diluted earnings per share

	2015	2016		2017
	RMB	RMB		RMB
Numerator:
Net income/(loss) attributable to Ctrip’s shareholders	2,507,655,884	(1,430,703,195	)	2,142,011,537
Eliminate the dilutive effect of interest expense of convertible notes	185,589,773	—		52,229,311

Numerator for diluted earnings/(loss) per share	2,693,245,657	(1,430,703,195	)	2,194,240,848


Denominator:
Denominator for basic earnings/(loss) per ordinary share
- weighted average ordinary shares outstanding	37,797,698	59,166,582		66,300,808
Dilutive effect of share options	2,962,481	—		2,978,969
Dilutive effect of convertible notes	6,102,417	—		2,345,083
Dilutive effect of convertible notes sold warrants	512,652	—		151,033

Denominator for diluted earnings/(loss) per ordinary share	47,375,248	59,166,582		71,775,893


Basic earnings/(loss) per ordinary share	66.34	(24.18	)	32.31

Diluted earnings/(loss) per ordinary share	56.85	(24.18	)	30.57


Basic earnings/(loss) per ADS	8.29	(3.02	)	4.04

Diluted earnings/(loss) per ADS	7.11	(3.02	)	3.82

Schedule of weighted average number of ordinary shares excluded from computation of diluted earnings /(loss) per share

	2015	2016	2017
	RMB	RMB	RMB

2017 Notes	—	435,248	—
2018 Notes	—	2,551,360	2,002,507
2020 Notes	—	1,608,985	1,608,984
2025 Notes	486,999	935,550	935,550
2022 Notes	—	559,282	1,860,885
2019 Priceline Notes	—	1,536,338	—
2020 Priceline Notes	—	599,400	—
2025 Priceline and Hillhouse Notes	100,046	1,825,838	1,825,838
2022 Priceline Notes	—	14,341	47,715
Outstanding weighted average stock options	64,074	3,678,030	99,695
Sold Warrants	1,734,865	303,176	—

	2,385,984	14,047,548	8,381,174

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2017

COMMITMENTS AND CONTINGENCIES

Schedule of operating lease commitments

		Office Premises
		RMB
2018		263,400,004
2019		188,973,971
2020		98,682,126
2021		66,924,998
2022		53,406,162
Thereafter		178,218,196

		849,605,457

PRINCIPAL ACCOUNTING POLICIES - Major VIEs and VIEs' subsidiaries (Details)	12 Months Ended
	Dec. 31, 2017 CNY (¥) item
Shanghai Ctrip Commerce \| Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers \| item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 30,000,000
Shanghai Huacheng \| Shanghai Ctrip Commerce
Major variable interest entities and their subsidiaries
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 100,000,000
Chengdu Ctrip \| Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers \| item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 500,000,000
Qunar Beijing \| Two senior officers of the Company
Major variable interest entities and their subsidiaries
Number of officers \| item	2
Shareholding percentage of VIE	100.00%
Registered capital of VIE	¥ 11,000,000

PRINCIPAL ACCOUNTING POLICIES - Key agreements with the VIEs and summary financial information of the VIEs (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2014 CNY (¥)
Financial information of the group's VIEs
Total assets	$ 24,906,394,926				¥ 162,048,477,313		¥ 144,413,901,668
Total liabilities	11,615,733,658				75,575,447,910		68,893,149,166
Cash and cash equivalents	2,803,896,483			¥ 19,215,674,674	18,242,991,687	$ 2,833,358,629	18,434,681,251	¥ 5,300,887,799
Short-term investment	4,323,492,324				28,129,938,110		14,112,862,288
Accounts receivables	700,713,570				4,559,052,701		4,624,818,322
Prepayments and other current assets	948,659,787				6,172,265,172		6,206,985,686
Accounts payable	1,146,458,548				7,459,203,252		7,278,791,082
Other payables and accruals	783,338,681				5,096,636,473		2,849,821,247
Advance from customers	1,209,217,609				7,867,532,529		8,190,840,057
Net revenues	4,115,953,924	¥ 26,779,631,018	¥ 19,228,439,814	10,897,568,061
Cost of revenues	719,027,574	4,678,209,103	4,729,750,192	3,043,439,819
Net income / (loss)	332,117,375	2,160,855,280	(1,636,230,855)	2,399,395,247
Net cash provided by operating activities	$ 1,086,464,078	¥ 7,068,861,226	5,272,730,491	3,048,809,916
Shareholders of our consolidated affiliated Chinese entities, except for Qunar Beijing \| Amended and restated exclusive option agreements
Financial information of the group's VIEs
Term of exclusive option agreements	10 years	10 years
Term of automatic renewal of exclusive option agreements	10 years	10 years
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information \| Amended and Restated Technical Consulting and Services Agreements
Financial information of the group's VIEs
Term of technical consulting and services agreements	10 years	10 years
Term of automatic renewal of technical consulting and services agreements	10 years	10 years
Written notice period required to be served for the termination of agreements	30 days	30 days
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information \| Amended and Restated Technical Consulting and Services Agreements \| Minimum
Financial information of the group's VIEs
Average rate per ticket based on number of tickets sold (in RMB or US dollars per ticket)	$ 0.8	¥ 5
Ctrip Computer Technology, Ctrip Travel Network and Ctrip Travel Information \| Amended and Restated Technical Consulting and Services Agreements \| Maximum
Financial information of the group's VIEs
Average rate per ticket based on number of tickets sold (in RMB or US dollars per ticket)	$ 1.2	¥ 8
Qunar Software \| Loan Agreements
Financial information of the group's VIEs
Notice period for termination of agreement	15 days	15 days
Qunar and Qunar Software \| Equity option agreement
Financial information of the group's VIEs
Written notice period for termination of agreement	30 days	30 days
Variable interest entities
Financial information of the group's VIEs
Amount of registered capital and PRC statutory reserves of VIEs					922,000,000
Total assets					21,755,512,736		30,544,580,876
Less: Inter-company receivables					(1,569,895,648)		(2,050,819,348)
Total assets excluding inter-company					20,185,617,088		28,493,761,528
Total liabilities					19,282,345,546		29,101,732,239
Less: Inter-company payables					(12,114,432,077)		(15,904,065,265)
Total liabilities excluding inter-company					7,167,913,469		13,197,666,974
Cash and cash equivalents					6,600,000,000		10,000,000,000
Short-term investment					6,100,000,000		6,500,000,000
Accounts receivables					3,300,000,000		3,900,000,000
Prepayments and other current assets					1,900,000,000		3,500,000,000
Investments (non-current)					1,400,000,000		2,800,000,000
Accounts payable					3,300,000,000		4,300,000,000
Other payables and accruals					1,500,000,000		1,300,000,000
Advance from customers					1,100,000,000		5,000,000,000
Short- term debt					¥ 800,000,000		¥ 1,200,000,000
Net revenues		¥ 8,237,250,837	8,706,139,377	6,384,556,234
Cost of revenues		2,489,892,564	2,442,997,433	1,983,511,461
Net income / (loss)		¥ 863,231,207	100,653,423	(73,523,163)
Revenues as a percent of total	31.00%	31.00%
Net income before the deduction of inter-company consulting fee charges		¥ 2,700,000,000	¥ 2,800,000,000	¥ 1,000,000,000
Service fees charged from affiliates as percentage of their total net income	68.30%	68.30%	96.30%	107.10%
Net cash provided by operating activities		¥ 1,232,432,873	¥ 7,190,925,721	¥ 160,298,446

PRINCIPAL ACCOUNTING POLICIES - Foreign currencies and land use rights (Details) - ¥ / $	12 Months Ended
	Dec. 31, 2017	Dec. 29, 2017
RMB/USD exchange rate used in translation		0.1537
Minimum
Useful life	3 years
Maximum
Useful life	10 years
Land use rights \| Minimum
Useful life	40 years
Land use rights \| Maximum
Useful life	50 years

PRINCIPAL ACCOUNTING POLICIES - Property, equipment and software (Details)	12 Months Ended
	Dec. 31, 2017
Building \| Minimum
Property, equipment and software
Estimated useful life	30 years
Building \| Maximum
Property, equipment and software
Estimated useful life	40 years
Website-related equipment
Property, equipment and software
Estimated useful life	5 years
Computer equipment \| Minimum
Property, equipment and software
Estimated useful life	3 years
Computer equipment \| Maximum
Property, equipment and software
Estimated useful life	5 years
Furniture and fixtures \| Minimum
Property, equipment and software
Estimated useful life	3 years
Furniture and fixtures \| Maximum
Property, equipment and software
Estimated useful life	5 years
Software \| Minimum
Property, equipment and software
Estimated useful life	3 years
Software \| Maximum
Property, equipment and software
Estimated useful life	5 years

PRINCIPAL ACCOUNTING POLICIES - Acquisitions (Details) £ in Billions					1 Months Ended				12 Months Ended
	Dec. 31, 2016 CNY (¥) shares	Dec. 09, 2016 GBP (£)	Dec. 09, 2016 CNY (¥)	Dec. 10, 2015 shares	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Oct. 31, 2015 USD ($) Vote shares	Oct. 31, 2015 CNY (¥) Vote shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 CNY (¥)
Business combination disclosures
Shares outstanding \| shares	64,155,412								67,600,654	67,600,654			64,155,412
Purchase price allocation
Decrease in the non-controlling interest's ownership										¥ 2,311,932,774			¥ 6,532,152,666	¥ 46,236,902
Skyscanner
Business combination disclosures
Purchase consideration		£ 1.4	¥ 12,000,000,000
Acquisition consideration in cash											£ 1.2		10,000,000,000
Cash portion of the total purchase consideration agreed			10,100,000,000
Increase in consideration as measurement period adjustment			60,000,000
Purchase price allocation
Net assets	¥ 325,000,000												325,000,000
Cash acquired			571,000,000
Non-controlling interests	316,000,000												316,000,000
Goodwill													9,583,716,450
Identifiable intangible assets	3,100,000,000												3,100,000,000
Deferred tax liabilities			620,000,000
Qunar
Business combination disclosures
Purchase consideration					$ 5,103,252,544	¥ 32,541,365,375
Equity interest (as a percent)							45.00%	45.00%
Ownership of share capital held (as a percent)							48.00%	48.00%
Purchase price allocation
Net liabilities	628,000,000												628,000,000
Non-controlling interests	17,900,000,000												17,900,000,000
Goodwill	43,600,000,000												582,240,644
Identifiable intangible assets	9,900,000,000												9,900,000,000
Cash and cash equivalents	5,200,000,000												5,200,000,000
Non-current assets	1,000,000,000												1,000,000,000
Short term debts	3,900,000,000												3,900,000,000
Other current liabilities	7,100,000,000												7,100,000,000
Non-current liability	93,000,000												93,000,000
Prepayments and other current assets	4,300,000,000												4,300,000,000
Deferred tax liabilities	2,500,000,000												2,500,000,000
Decrease in the non-controlling interest's ownership										2,200,000,000			15,500,000,000
Additional paid-in capital from the newly issued ordinary shares										600,000,000			3,700,000,000
Pro forma results
Pro-forma net revenues														14,812,533,000
Pro-forma net loss														(5,086,934,000)
Qunar \| Trademark and domain
Purchase price allocation
Identifiable intangible assets	9,000,000,000												9,000,000,000
Qunar \| Technology and supplier network for new products
Purchase price allocation
Weighted average useful life					5 years 2 months 12 days	5 years 2 months 12 days
Qunar \| Baidu
Business combination disclosures
Purchase consideration					$ 3,416,184,974	¥ 21,698,582,100
Shares issued as consideration (in shares) \| shares							11,000,000	11,000,000
Fair value of shares issued as consideration							$ 3,400,000,000	¥ 21,700,000,000
Shares issued for the benefit of employees \| shares				4,000,000
Qunar \| Qunar Employees
Business combination disclosures
Purchase consideration					$ 1,687,067,570	¥ 10,842,783,275
Qunar \| Common Class A
Business combination disclosures
Number of shares acquired \| shares							179,000,000	179,000,000
Shares outstanding \| shares							193,000,000	193,000,000
Number of votes per share \| Vote							3	3
Qunar \| Common Class B
Business combination disclosures
Number of shares acquired \| shares							11,000,000	11,000,000
Number of votes per share \| Vote							1	1
Number of shares exchanged for shares issued to employees \| shares				66,000,000
Number of shares deemed to be owned \| shares							256,000,000	256,000,000
Others
Business combination disclosures
Purchase consideration										251,000,000			120,000,000	862,000,000
Purchase price allocation
Increase (decrease) in goodwill as measurement period adjustment										¥ 291,000,000			159,000,000	¥ 817,000,000
Certain investments
Business combination disclosures
Purchase consideration \| $									$ 400,000,000			$ 2,900,000,000
Supplier relationship \| Skyscanner
Purchase price allocation
Identifiable intangible assets			¥ 929,000,000
Intangible asset useful life		9 years	9 years
IT Platform \| Skyscanner
Purchase price allocation
Identifiable intangible assets			¥ 191,000,000
Intangible asset useful life		6 years	6 years
Technology and supplier network for new products \| Qunar
Purchase price allocation
Identifiable intangible assets	¥ 900,000,000												¥ 900,000,000

PRINCIPAL ACCOUNTING POLICIES - Goodwill and other intangible assets to sales and marketing (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)
Intangible assets
Impairment of goodwill		¥ 0	¥ 0	¥ 0
Impairment on other intangible assets		0	0	0
Accrued liability for customer reward program
Accrued liability for customer reward program	$ 93,697,131		658,170,680		¥ 609,621,643
Amount of expenses for group's customers reward program		100,000,000	202,000,000	399,000,000
Allowance for doubtful accounts activity
Balance at beginning of year		58,841,826	38,237,658	14,707,184
Provision for doubtful accounts	$ 15,053,760	97,944,278	32,339,617	32,080,786
Write-offs		(28,064,747)	(11,735,449)	(8,550,312)
Balance at end of period		128,721,357	58,841,826	38,237,658
Sales and marketing
Advertising expenses		¥ 5,100,000,000	¥ 2,800,000,000	¥ 1,800,000,000
Minimum
Intangible assets
Intangible asset useful life	3 years	3 years
Maximum
Intangible assets
Intangible asset useful life	10 years	10 years

PRINCIPAL ACCOUNTING POLICIES - Share incentive plans (Details) - shares	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based compensation disclosures
Number of option outstanding under share incentive plans (in shares)		4,710,758	5,532,515	5,005,461	4,972,178
Number of options granted under share incentive plan		631,166	937,002	625,006
Ctrip 2005 Option Plan
Share-based compensation disclosures
Number of option outstanding under share incentive plans (in shares)		0	107,572
Ctrip 2007 Incentive Plan
Share-based compensation disclosures
Number of option outstanding under share incentive plans (in shares)		4,367,099	5,424,943
Ctrip 2007 Incentive Plan \| Outstanding weighted average stock options \| Employees
Share-based compensation disclosures
Vesting period		4 years
Number of options granted under share incentive plan		138,061	937,002
Ctrip 2007 Incentive Plan \| Restricted stock units (RSUs)
Share-based compensation disclosures
Requisite service period		4 years
Restriction period		4 years
Restricted stock units outstanding (in shares)		1,095,722	1,462,239
Global Incentive Plan \| Outstanding weighted average stock options \| Employees
Share-based compensation disclosures
Number of option outstanding under share incentive plans (in shares)		343,659
Number of options granted under share incentive plan	493,105
Requisite service period	4 years

PRINCIPAL ACCOUNTING POLICIES - Summary of share option activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Shares
Outstanding, beginning	5,532,515	5,005,461	4,972,178
Granted	631,166	937,002	625,006
Exercised	(1,353,697)	(368,722)	(506,163)
Forfeited	(99,226)	(41,226)	(85,560)
Outstanding, ending	4,710,758	5,532,515	5,005,461	4,972,178
Vested and expect to vest, ending	4,570,018
Exercisable, ending	2,951,517
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 157.82	$ 122.00	$ 101.03
Granted (in dollars per share)	43.03	322.20	247.91
Exercised (in dollars per share)	68.95	80.70	65.65
Forfeited (in dollars per share)	133.92	199.32	156.32
Outstanding, ending (in dollars per share)	168.80	$ 157.82	$ 122.00	$ 101.03
Vested and expect to vest, ending (in dollars per share)	167.40
Exercisable, ending (in dollars per share)	$ 141.77
Weighted Average Remaining Contractual Life (Years)
Outstanding	4 years 8 months 19 days	4 years 6 months 15 days	4 years 9 months 7 days	5 years 2 months 1 day
Vested and expect to vest at the end of the period	4 years 8 months 1 day
Exercisable at the end of the period	3 years 9 months 11 days
Aggregate Intrinsic Value
Outstanding	$ 866,781,417	$ 899,966,907	$ 1,244,544,670	$ 405,399,251
Vested and expect to vest	847,267,373
Exercisable	$ 622,855,872
Assumptions
Pre-vesting forfeiture rate assumptions (as a percent)	8.00%
Closing stock price (in dollars per share)	$ 352.80
Total intrinsic value of options exercised	$ 522,000,000	$ 257,000,000	$ 178,000,000

PRINCIPAL ACCOUNTING POLICIES - Summary of outstanding and exercisable options (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 $ / shares	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 $ / shares	Dec. 31, 2015 CNY (¥)
Share-based compensation disclosures by exercise price range
Number of shares, outstanding	4,710,758
Number of shares, exercisable	2,951,517
Assumptions
Weighted average fair value of options granted (in dollars per share) \| $ / shares	$ 376.78		$ 140.95		$ 109.93
Unrecognized compensation cost \| $	$ 262,000,000
Weighted average recognized period	2 years 8 months 12 days	2 years 8 months 12 days
Proceeds from exercise of share options	$ 112,465,663	¥ 731,735,342		¥ 211,720,242		¥ 52,117,597
0.00 - 100.00
Share-based compensation disclosures by exercise price range
Number of shares, outstanding	1,671,410
Weighted-average exercise price, outstanding (in dollars per share) \| $ / shares	$ 61.24
Weighted-average remaining contractual life (years), outstanding	3 years 10 months 24 days	3 years 10 months 24 days
Number of shares, exercisable	1,306,991
Weighted-average exercise price, exercisable (in dollars per share) \| $ / shares	$ 78.31
Weighted-average remaining contractual life (years), exercisable	2 years 11 months 5 days	2 years 11 months 5 days
100.01 - 200.00
Share-based compensation disclosures by exercise price range
Number of shares, outstanding	1,460,228
Weighted-average exercise price, outstanding (in dollars per share) \| $ / shares	$ 155.54
Weighted-average remaining contractual life (years), outstanding	3 years 10 months 2 days	3 years 10 months 2 days
Number of shares, exercisable	1,128,628
Weighted-average exercise price, exercisable (in dollars per share) \| $ / shares	$ 151.22
Weighted-average remaining contractual life (years), exercisable	3 years 8 months 1 day	3 years 8 months 1 day
200.01 - 300.00
Share-based compensation disclosures by exercise price range
Number of shares, outstanding	664,262
Weighted-average exercise price, outstanding (in dollars per share) \| $ / shares	$ 253.65
Weighted-average remaining contractual life (years), outstanding	5 years 8 months 19 days	5 years 8 months 19 days
Number of shares, exercisable	299,221
Weighted-average exercise price, exercisable (in dollars per share) \| $ / shares	$ 250.70
Weighted-average remaining contractual life (years), exercisable	5 years 8 months 9 days	5 years 8 months 9 days
300.01 - 400.00
Share-based compensation disclosures by exercise price range
Number of shares, outstanding	914,858
Weighted-average exercise price, outstanding (in dollars per share) \| $ / shares	$ 324.87
Weighted-average remaining contractual life (years), outstanding	6 years 10 months 17 days	6 years 10 months 17 days
Number of shares, exercisable	216,677
Weighted-average exercise price, exercisable (in dollars per share) \| $ / shares	$ 324.92
Weighted-average remaining contractual life (years), exercisable	6 years 10 months 13 days	6 years 10 months 13 days

PRINCIPAL ACCOUNTING POLICIES - Assumptions used to calculate fair value of share options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based compensation disclosures
Risk-free interest rate, minimum (as a percent)	1.73%	1.16%	1.35%
Risk-free interest rate, maximum (as a percent)	1.94%	1.66%	1.59%
Expected life (years)	5 years	5 years	5 years
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Volatility, minimum (as a percent)	46.00%	48.00%	49.00%
Volatility, maximum (as a percent)	48.00%	51.00%	50.00%
Fair value of options at grant date per share	$ 376.78	$ 140.95	$ 109.93
Minimum
Share-based compensation disclosures
Fair value of options at grant date per share	142.29	133.85	105.16
Maximum
Share-based compensation disclosures
Fair value of options at grant date per share	$ 430.87	$ 141.72	$ 112.76

PRINCIPAL ACCOUNTING POLICIES - Summary of RSUs activities (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 157.82	$ 122.00	$ 101.03
Granted (in dollars per share)	43.03	322.20	247.91
Exercised (in dollars per share)	68.95	80.70	65.65
Forfeited (in dollars per share)	133.92	199.32	156.32
Outstanding, ending (in dollars per share)	$ 168.80	$ 157.82	$ 122.00
Unrecognized compensation cost	$ 262.0
Weighted average recognized period	2 years 8 months 12 days
Restricted stock units (RSUs)
Number of Shares
Outstanding at the beginning of the period (in shares)	1,462,239	865,408	1,058,608
Granted (in shares)	15,664	1,183,094	229,603
Vested (in shares)	(285,375)	(492,825)	(271,683)
Forfeited (in shares)	(96,806)	(93,438)	(151,120)
Outstanding at the end of the period (in shares)	1,095,722	1,462,239	865,408
Weighted Average Exercise Price
Outstanding, beginning (in dollars per share)	$ 263.28	$ 185.17	$ 158.55
Granted (in dollars per share)	323.92	301.62	249.31
Exercised (in dollars per share)	191.21	223.00	129.21
Forfeited (in dollars per share)	274.71	237.69	181.47
Outstanding, ending (in dollars per share)	$ 281.91	$ 263.28	$ 185.17
Share-based compensation expense	$ 281.9	$ 217.8	$ 48.6
Unrecognized compensation cost	$ 183.0
Weighted average recognized period	1 year 3 months 18 days
Ctrip 2007 Incentive Plan \| Restricted stock units (RSUs)
Share-based compensation arrangement by share-based payment award
Requisite service period	4 years

PRINCIPAL ACCOUNTING POLICIES - Other income/ (expense) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Other income/ (expense)
Gain on disposal of cost method investment (Note 8)		¥ 1,374,462,407	¥ 149,066,258
Foreign exchange gains/(losses)		468,671,832	(557,995,284)	¥ 12,638,982
Subsidy income		263,538,347	220,631,285	199,418,778
Gain on disposal of available-for-sale investment (Note 8)	$ 6,140,402	39,951,298	140,651,759
Dividends from long-term investment		46,550,230	48,911,066
Gain on disposal of a subsidiary	1,754,052	11,412,387
Gain on deconsolidation of subsidiaries			252,000	2,294,451,702
Impairments of cost method investments	(21,405,634)	(139,271,481)	(11,628,980)
Impairments of available-for-sale investment	(41,760,725)	(271,707,804)	(36,357,902)
Provision/impairment for an equity method investment (Note 8 and Note 13)	(148,685,890)	(967,395,005)
Others		52,785,926	19,621,511	(25,529,632)
Total	$ 135,099,540	¥ 878,998,137	¥ (26,848,287)	¥ 2,480,979,830

PRINCIPAL ACCOUNTING POLICIES - Statutory reserves and dividends (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
China
Statutory reserves disclosures
Portion of after-tax profit to be allocated to general reserve under PRC law (as a percent)	10.00%
Maximum percentage of statutory general reserve related to entity's registered capital	50.00%
Appropriations to statutory reserves	¥ 146	¥ 69	¥ 35
Dividends
Restricted net assets of company's PRC subsidiaries and VIEs not distributable in form of dividends to parent	5,700
Accumulated profit of subsidiaries in PRC distributable in form of dividends to parent	¥ 12,000	¥ 8,000	¥ 7,000
Withholding tax rate for dividends distributed by foreign invested enterprise to their immediate holding companies outside mainland china (as a percent)	10.00%
Taiwan
Statutory reserves disclosures
Portion of after-tax profit to be allocated to general reserve under PRC law (as a percent)	10.00%

PRINCIPAL ACCOUNTING POLICIES - Earnings/(loss) per share, treasury stock and segment reporting (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 item	Dec. 31, 2015	Nov. 30, 2015	Apr. 30, 2014 USD ($)
Treasury stock disclosures
Approved repurchase plan \| $				$ 600
Segment reporting disclosures
Number of reportable segments \| item	1
ADS
Treasury stock disclosures
Ratio of ADSs to ordinary shares		8	4

PREPAYMENTS AND OTHER CURRENT ASSETS (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
PREPAYMENTS AND OTHER CURRENT ASSETS
Prepayments and other deposits		¥ 4,575,682,047	¥ 5,082,058,275
Receivable from loans to the users		563,531,742	87,773,083
Prepaid expenses		424,602,556	439,983,044
Receivables from financial institution		96,066,261	207,182,863
Others		512,382,566	389,988,421
Total	$ 948,659,787	¥ 6,172,265,172	¥ 6,206,985,686

LONG-TERM DEPOSITS AND PREPAYMENTS (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
LONG-TERM DEPOSITS AND PREPAYMENTS
Deposits paid to airline suppliers		¥ 276,128,171	¥ 244,072,331
Prepayments for purchase of long lived assets		241,378,538	625,084,070
Deposits paid to hotel suppliers		74,723,795	126,728,198
Others		247,689,752	151,394,598
Total	$ 129,093,380	¥ 839,920,256	¥ 1,147,279,197

LONG-TERM LOAN RECEIVABLE (Details)	1 Months Ended	12 Months Ended
LONG-TERM LOAN RECEIVABLE (Details)	Apr. 30, 2015 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)
Long-term loan receivable
Amount of loan		¥ 215,673,057	$ 2,920,247	¥ 19,000,000
Other current assets		6,206,985,686	$ 948,659,787	6,172,265,172
eHi
Long-term loan receivable
Amount of loan	¥ 300,000,000
Interest rate (as a percent)	6.90%
Term of the loan	3 years
Repayment of loans		¥ 200,000,000
Other current assets				¥ 100,000,000

LAND USE RIGHTS (Details)	12 Months Ended
LAND USE RIGHTS (Details)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)
Intangible assets
Amortization expense	¥ 391,000,000	¥ 255,000,000	¥ 58,000,000
Net book value		99,544,772		$ 14,871,949	¥ 96,761,364
Minimum
Intangible assets
Useful life	3 years
Maximum
Intangible assets
Useful life	10 years
Land use rights
Intangible assets
Amortization expense	¥ 3,000,000	¥ 3,000,000	¥ 2,000,000
Land use rights \| Minimum
Intangible assets
Useful life	40 years
Land use rights \| Maximum
Intangible assets
Useful life	50 years

PROPERTY, EQUIPMENT AND SOFTWARE (Details)	12 Months Ended
PROPERTY, EQUIPMENT AND SOFTWARE (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)
Property, equipment and software
Less: accumulated depreciation and amortization			¥ (1,253,759,503)		¥ (1,658,282,084)
Total net book value	$ 863,086,613		5,591,960,081		5,615,500,429
Depreciation	$ 75,281,051	¥ 489,801,100	461,391,147	¥ 255,966,352
Building
Property, equipment and software
Original value			5,148,644,010		5,162,445,022
Computer equipment
Property, equipment and software
Original value			731,530,644		926,427,543
Website-related equipment
Property, equipment and software
Original value			536,705,335		637,528,902
Furniture and fixtures
Property, equipment and software
Original value			178,703,320		232,846,204
Software
Property, equipment and software
Original value			124,082,233		166,758,939
Leasehold improvements
Property, equipment and software
Original value			115,997,785		140,221,796
Construction in progress
Property, equipment and software
Original value			¥ 10,056,257		¥ 7,554,107

INVESTMENTS - Long-term investments (Details)	12 Months Ended
INVESTMENTS - Long-term investments (Details)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
INVESTMENTS
Held to maturity investments			¥ 40,000,000	¥ 1,059,812,729
Available-for-sale investments			18,552,440,485	14,467,476,607
Equity method investments			6,068,391,137	4,114,199,782
Cost method investments			912,953,646	891,333,247
Total net book value		$ 3,930,618,826	¥ 25,573,785,268	¥ 20,532,822,365
Held to maturity investment
INVESTMENTS
Held to maturity investments	¥ 1,000,000,000
Term of time deposit	3 years
Interest rate of time deposit (as a percent)	3.90%

INVESTMENTS - Available-for-sale investments (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale investments, Cost
Listed equity securities, Cost, after adjusted with other-than-temporary impairment	¥ 6,135,979,970	¥ 5,642,265,038
Unlisted debt securities, Cost, after adjusted with other-than-temporary impairment	5,362,010,027	6,263,538,336
Total Available-for-sale investments, Cost, after adjusted with other-than-temporary impairment	11,497,989,997	11,905,803,374
Available-for-sale investments, Gross Unrealized Gains
Listed equity securities, Gross Unrealized Gains, including forex adjustment	6,299,221,728	2,116,672,845
Unlisted debt securities, Gross Unrealized Gains, including forex adjustment	909,212,411	572,369,972
Total Available-for-sale investments, Gross Unrealized Gains, including forex adjustment	7,208,434,139	2,689,042,817
Available-for-sale investments, Gross Unrealized Losses
Listed equity securities, Gross Unrealized Losses, including forex adjustment		(97,057,486)
Unlisted debt securities, Gross Unrealized Losses, including forex adjustment	(153,983,651)	(30,312,098)
Total Available-for-sale investments, Gross Unrealized Losses, including forex adjustment	(153,983,651)	(127,369,584)
Available-for-sale investments, Fair Value
Listed equity securities, Fair Value	12,435,201,698	7,661,880,397
Unlisted debt securities, Fair Value	6,117,238,787	6,805,596,210
Total Available-for-sale investments, Fair Value	¥ 18,552,440,485	¥ 14,467,476,607

INVESTMENTS - MakeMyTrip and China Eastern Airlines (Details) $ in Millions	1 Months Ended			12 Months Ended
	Apr. 30, 2016 CNY (¥)	Jan. 31, 2016 USD ($)	Jan. 31, 2016 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Investment transaction disclosures
Fair value of available-for-sale investment				¥ 18,552,440,485	¥ 14,467,476,607
Fair value of available-for-sale investments, which are in loss position				3,400,000,000	865,000,000
unrealized securities holding gain net of tax, reported in other comprehensive income				305,000,000	(7,000,000)	¥ 108,000,000
Total cash paid for available-for-sale securities				1,100,000,000	4,200,000,000	¥ 100,000,000
MakeMyTrip
Investment transaction disclosures
Purchase of shares, cost of share aggregate		$ 180	¥ 1,200,000,000
Percentage of equity interest		10.00%	10.00%
Fair value of available-for-sale investment				2,100,000,000	1,500,000,000
China Eastern Airline
Investment transaction disclosures
Purchase of shares, cost of share aggregate	¥ 3,000,000,000
Percentage of equity interest	3.00%
Fair value of available-for-sale investment				¥ 3,800,000,000	¥ 3,300,000,000

INVESTMENTS - Homeinns and BTG (Details)	1 Months Ended	12 Months Ended
INVESTMENTS - Homeinns and BTG (Details)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Equity method investment disclosures
Equity in income / (loss) of affiliates		$ (10,008,156)	¥ (65,116,066)	¥ 601,883,179	¥ (135,780,312)
Carrying value of investments under equity method	¥ 4,114,199,782		6,068,391,137	¥ 4,114,199,782
BTG
Equity method investment disclosures
Equity method investment, ownership interest (as a percent)	22.00%			22.00%
Equity in income / (loss) of affiliates	¥ 1,400,000,000
Homeinns and BTG
Equity method investment disclosures
Carrying value of investments under equity method	¥ 2,500,000,000		¥ 2,600,000,000	¥ 2,500,000,000

INVESTMENTS - Tujia (Details) - CNY (¥)	12 Months Ended
INVESTMENTS - Tujia (Details) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INVESTMENTS
Gain on deconsolidation of subsidiaries		¥ 252,000	¥ 2,294,451,702
Carrying value of investments under equity method	¥ 6,068,391,137	4,114,199,782
Fair value of preferred shares under available-for-sale	6,117,238,787	¥ 6,805,596,210
Tujia
INVESTMENTS
Gain on deconsolidation of subsidiaries			¥ 2,300,000,000
Fair value of converted part of preferred shares to common shares	1,700,000,000
Carrying value of investments under equity method	1,500,000,000
Fair value of preferred shares under available-for-sale	¥ 1,700,000,000

INVESTMENTS - eLong (Details) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Equity method investment disclosures
Carrying value of investments under equity method	¥ 6,068,391,137	¥ 4,114,199,782
Fair value of preferred shares under available-for-sale	6,117,238,787	¥ 6,805,596,210
eLong
Equity method investment disclosures
Equity method investment, ownership interest (as a percent)			38.00%
Carrying value of investments under equity method	194,000,000
Fair value of preferred shares under available-for-sale	¥ 1,700,000,000

INVESTMENTS - Qunar (Details)		3 Months Ended	12 Months Ended
INVESTMENTS - Qunar (Details)	Dec. 10, 2015 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Equity method investment disclosures
Share of cumulative loss			$ (10,008,156)	¥ (65,116,066)	¥ 601,883,179	¥ (135,780,312)
Qunar
Equity method investment disclosures
Share of cumulative loss		¥ (2,400,000,000)
Gain from the re-measurement of the previously held equity interest to the fair value in the business acquisition	¥ 2,400,000,000

INVESTMENTS - Skysea (Details) - Skysea $ in Millions	Dec. 31, 2014 USD ($)
Equity method investment disclosures
Equity method investment, ownership interest (as a percent)	35.00%
Loan provided	$ 80
RCL
Equity method investment disclosures
Equity method investment, ownership interest (as a percent)	35.00%
Loan provided	$ 80

INVESTMENTS - Unaudited condensed financial information of equity investments (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Investment transaction disclosures
Carrying value of investments under equity method		¥ 6,068,391,137	¥ 4,114,199,782
Operating data:
Equity in income / (loss) of affiliates	$ (10,008,156)	(65,116,066)	601,883,179	¥ (135,780,312)
Balance sheet data:
Total cash paid for equity method investments		200,000,000	1,000,000,000	2,900,000,000
Investment funds
Investment transaction disclosures
Carrying value of investments under equity method		780,000,000	616,000,000
Qunar
Operating data:
Revenue				841,814,520
Gross profit				537,240,212
Income/(loss) from operations				(4,792,664,736)
Net loss				(4,917,200,749)
Net loss attributable to our equity method investments companies				(2,352,388,839)
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equity investments in step acquisitions				2,352,388,839
Balance sheet data:
Current assets				9,433,080,372
Long-term assets				1,072,464,782
Current liabilities				10,442,341,153
Long-term liabilities				93,019,969
Non-controlling interests				5,282,358
Other equity investments
Operating data:
Revenue			5,917,850,003	7,069,224,177
Gross profit			4,785,282,088	1,581,396,551
Income/(loss) from operations			155,471,096	(20,961,158)
Net loss			(62,190,299)	(189,461,030)
Net loss attributable to our equity method investments companies			(55,314,772)	(127,465,948)
Add: Equity dilution impact			11,027,933	(8,314,364)
Add: Gain from disposal of equity investments, including the remeasurement gain/(loss) from previously held equity investments in step acquisitions			1,369,310,070
Equity in income / (loss) of affiliates			1,325,023,231	(135,780,312)
Balance sheet data:
Current assets			3,353,714,017	4,091,410,052
Long-term assets			17,298,415,142	10,102,034,376
Current liabilities			11,595,906,780	4,043,523,264
Long-term liabilities			1,650,938,946	466,730,372
Non-controlling interests			1,944,540,518	¥ 76,928,317
eLong
Operating data:
Revenue			1,895,409,404
Gross profit			997,644,227
Income/(loss) from operations			(1,312,847,794)
Net loss			(1,635,384,928)
Net loss attributable to our equity method investments companies			(722,307,716)
Add: Equity dilution impact			(832,336)
Equity in income / (loss) of affiliates			(723,140,052)
Balance sheet data:
Current assets			1,978,681,514
Long-term assets			454,710,971
Current liabilities			1,687,293,575
Long-term liabilities			15,970,032
Non-controlling interests			¥ 15,512,748
Equity investments
Operating data:
Revenue		14,242,886,080
Gross profit		8,145,081,600
Income/(loss) from operations		80,460,912
Net loss		(222,770,078)
Net loss attributable to our equity method investments companies		(78,644,006)
Add: Equity dilution impact		13,527,940
Equity in income / (loss) of affiliates		(65,116,066)
Balance sheet data:
Current assets		9,836,444,371
Long-term assets		16,552,821,327
Current liabilities		8,061,346,134
Long-term liabilities		6,191,180,525
Non-controlling interests		¥ 323,853,090

INVESTMENTS - Cost method investments (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INVESTMENTS
Cost method investments	¥ 912,953,646	¥ 891,333,247
Proceeds from disposal of cost method investments	1,400,000,000	317,000,000
Cost method investments	200,000,000	100,000,000	¥ 100,000,000
Gain on disposal of cost method investment (Note 8)	¥ 1,374,462,407	¥ 149,066,258

INVESTMENTS - Impairments - CNY (¥) ¥ in Millions	12 Months Ended
INVESTMENTS - Impairments - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairments
Carrying value, cost method impairments apply non-recurring fair value measures	¥ 0	¥ 0	¥ 0
Carrying value, equity method impairments apply non-recurring fair value measures	0	0	0
Other income/ (expense)
Impairments
Impairment charges under available-for-sale investments	272	36	0
Impairment charges under equity method investments	64	0	0
Impairment charges under cost method investments	¥ 139	¥ 12	¥ 0

FAIR VALUE MEASUREMENT (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)
Fair value measurement
Short-term investment	$ 4,323,492,324	¥ 28,129,938,110		¥ 14,112,862,288
Available-for-sale investments		18,552,440,485		14,467,476,607
Measured on recurring basis
Fair value measurement
Total	7,007,539,787	45,593,156,115	$ 4,269,069,801	29,640,151,624
Measured on recurring basis \| Financial products
Fair value measurement
Short-term investment	4,133,182,123	26,891,722,845	1,211,910,189	8,414,292,445
Measured on recurring basis \| Time deposits
Fair value measurement
Short-term investment	22,899,772	148,992,785	973,409,560	6,758,382,572
Measured on recurring basis \| Listed equity securities
Fair value measurement
Available-for-sale investments	1,911,255,506	12,435,201,698	1,103,540,314	7,661,880,397
Measured on recurring basis \| Unlisted debt securities
Fair value measurement
Available-for-sale investments	$ 940,202,386	6,117,238,787	$ 980,209,738	6,805,596,210
Measured on recurring basis \| Level 1
Fair value measurement
Total		12,435,201,698		7,661,880,397
Measured on recurring basis \| Level 1 \| Listed equity securities
Fair value measurement
Available-for-sale investments		12,435,201,698		7,661,880,397
Measured on recurring basis \| Level 2
Fair value measurement
Short-term investment		27,450,451,246		15,172,675,017
Measured on recurring basis \| Level 2 \| Financial products
Fair value measurement
Short-term investment		26,891,722,845		8,414,292,445
Measured on recurring basis \| Level 2 \| Time deposits
Fair value measurement
Short-term investment		148,992,785		6,758,382,572
Measured on recurring basis \| Level 2 \| Unlisted debt securities
Fair value measurement
Available-for-sale investments		409,735,616
Measured on recurring basis \| Level 3
Fair value measurement
Total		5,707,503,171		6,805,596,210
Measured on recurring basis \| Level 3 \| Unlisted debt securities
Fair value measurement
Available-for-sale investments		¥ 5,707,503,171		¥ 6,805,596,210

FAIR VALUE MEASUREMENT - Roll forward of major Level 3 investments (Details) - Level 3 - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Roll forward of major Level 3 investments
Fair value of Level 3 investment, beginning balance	¥ 6,805,596,210	¥ 5,466,103,304
Transfer in and/or out of level 3	(1,755,271,349)	1,587,400,415
New addition	455,441,000
Disposal of investment	(16,916,380)	(317,261,674)
Effect of exchange rate change	(193,579,698)	325,391,864
Other than temporary impairment	(155,500,570)	(36,357,902)
The change in fair value of the investment	567,733,958	(219,679,797)
Fair value of Level 3 investment, ending balance	¥ 5,707,503,171	¥ 6,805,596,210

FAIR VALUE MEASUREMENT - Significant unobservable inputs (Details)	12 Months Ended
	Dec. 31, 2017
Significant unobservable inputs used in the valuation
Dividend yield (as a percent)	0.00%
Minimum
Significant unobservable inputs used in the valuation
Weighted average cost of capital (as a percent)	14.50%
Lack of marketability discount (as a percent)	10.00%
Risk-free rate (as a percent)	1.80%
Expected volatility (as a percent)	32.94%
Maximum
Significant unobservable inputs used in the valuation
Weighted average cost of capital (as a percent)	17.00%
Lack of marketability discount (as a percent)	15.00%
Risk-free rate (as a percent)	3.50%
Expected volatility (as a percent)	38.00%
Liquidation scenario \| Minimum
Significant unobservable inputs used in the valuation
Probability (as a percent)	20.00%
Liquidation scenario \| Maximum
Significant unobservable inputs used in the valuation
Probability (as a percent)	70.00%
Redemption scenario \| Minimum
Significant unobservable inputs used in the valuation
Probability (as a percent)	20.00%
Redemption scenario \| Maximum
Significant unobservable inputs used in the valuation
Probability (as a percent)	30.00%
IPO scenario \| Minimum
Significant unobservable inputs used in the valuation
Probability (as a percent)	30.00%
IPO scenario \| Maximum
Significant unobservable inputs used in the valuation
Probability (as a percent)	60.00%

GOODWILL (Details)		12 Months Ended
GOODWILL (Details)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Changes in the carrying amount of goodwill
Balance at beginning of year			¥ 56,015,185,590	¥ 45,690,440,903
Balance at end of period	¥ 56,015,185,590	$ 8,644,859,796	56,246,051,292	56,015,185,590
Skyscanner
Changes in the carrying amount of goodwill
Acquisition				9,583,716,450
Acquisition-decrease			(59,685,731)
Qunar
Changes in the carrying amount of goodwill
Acquisition	¥ 43,600,000,000			582,240,644
Others
Changes in the carrying amount of goodwill
Acquisition of others			¥ 290,551,433	¥ 158,787,593

INTANGIBLE ASSETS (Details) - CNY (¥)	12 Months Ended
INTANGIBLE ASSETS (Details) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016
Intangible assets disclosures
Intangible assets	¥ 14,494,943,771	¥ 14,278,779,458
Less: accumulated amortization	(744,627,850)	(354,009,527)
Net book value	13,750,315,921	13,924,769,931
Trademark and domain
Intangible assets disclosures
Intangible assets not subject to amortization	11,613,475,256	11,613,475,256
Net book value - intangible assets not subject to amortization	11,613,475,256	11,613,475,256
Others
Intangible assets disclosures
Intangible assets not subject to amortization	180,248,087	22,140,607
Net book value - intangible assets not subject to amortization	¥ 180,248,087	22,140,607
Minimum
Intangible assets disclosures
Intangible asset useful life	3 years
Maximum
Intangible assets disclosures
Intangible asset useful life	10 years
Business Relationship
Intangible assets disclosures
Intangible assets to be amortized	¥ 1,800,260,144	1,815,034,491
Less: accumulated amortization	(420,311,754)	(175,130,119)
Net book value - intangible assets to be amortized	¥ 1,379,948,390	1,639,904,372
Business Relationship \| Minimum
Intangible assets disclosures
Intangible asset useful life	5 years
Business Relationship \| Maximum
Intangible assets disclosures
Intangible asset useful life	10 years
Technology
Intangible assets disclosures
Intangible assets to be amortized	¥ 713,220,819	696,499,639
Less: accumulated amortization	(229,246,477)	(110,511,387)
Net book value - intangible assets to be amortized	¥ 483,974,342	585,988,252
Technology \| Minimum
Intangible assets disclosures
Intangible asset useful life	5 years
Technology \| Maximum
Intangible assets disclosures
Intangible asset useful life	10 years
Others
Intangible assets disclosures
Intangible assets to be amortized	¥ 187,739,465	131,629,465
Less: accumulated amortization	(95,069,619)	(68,368,021)
Net book value - intangible assets to be amortized	¥ 92,669,846	¥ 63,261,444
Others \| Minimum
Intangible assets disclosures
Intangible asset useful life	3 years
Others \| Maximum
Intangible assets disclosures
Intangible asset useful life	10 years

INTANGIBLE ASSETS - Amortization expense (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTANGIBLE ASSETS
Amortization of intangible assets	¥ 391,000,000	¥ 255,000,000	¥ 58,000,000
Annual estimated amortization expense for intangible assets subject to amortization
2018	396,364,608
2019	390,594,774
2020	374,512,943
2021	218,578,855
2022	174,564,565
Total	¥ 1,554,615,745

SHORT-TERM DEBT AND CURRENT PORTION OF LONG-TERM DEBT (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Short-term borrowings
Other short-term debt			¥ 48,157,745
Total	$ 2,507,766,699	¥ 16,316,282,473	6,887,309,589
Restricted cash	268,785,090	1,748,796,431	1,744,490,307
Short-term investment	4,323,492,324	28,129,938,110	14,112,862,288
2020 Notes
Short-term borrowings
Long-term debt, current maturities	700,000,000	4,554,403,494
2018 Notes
Short-term borrowings
Long-term debt, current maturities		3,076,419,373
2017 Notes
Short-term borrowings
Long-term debt, current maturities			170,867,230
Loan facility
Short-term borrowings
Short-term bank borrowings		8,685,459,606	¥ 6,668,284,614
Borrowing with an interest rate of 3.92%
Short-term borrowings
Short-term bank borrowings	$ 1,300,000,000	8,700,000,000
Bank deposits, current		2,300,000,000
Restricted cash		595,000,000
Short-term investment		¥ 1,700,000,000
Weighted average interest rate	3.92%	3.92%

RELATED PARTY TRANSACTIONS AND BALANCES (Details)						12 Months Ended
RELATED PARTY TRANSACTIONS AND BALANCES (Details)	Oct. 27, 2015 USD ($)	Oct. 27, 2015 CNY (¥)	Oct. 26, 2015 USD ($)	May 04, 2015 CNY (¥)	Mar. 12, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Oct. 26, 2015 CNY (¥)
RELATED PARTY TRANSACTIONS AND BALANCES
Repayment of entrusted loan and interest to related parties							¥ 1,820,911,519
Due from related parties, current							787,603,986				$ 57,448,327	¥ 373,776,048
Due from related parties, non-current							599,913,241				33,560,296	218,353,359
Due to related parties, current							837,421,345				64,322,406	418,500,869
Other payables and accruals							2,849,821,247				$ 783,338,681	5,096,636,473
eLong
RELATED PARTY TRANSACTIONS AND BALANCES
Commissions from related parties						¥ 573,127,860	261,139,916		¥ 7,191,870
Commissions to related parties						243,783,254	85,780,819		9,532,316
Due from related parties, current							132,381,883					152,825,748
Due to related parties, current							506,461,015					273,480,768
Hanting
RELATED PARTY TRANSACTIONS AND BALANCES
Commissions from related parties						76,792,041	44,094,542		17,740,390
Homeinns and BTG
RELATED PARTY TRANSACTIONS AND BALANCES
Commissions from related parties						62,528,564	66,921,837		34,556,539
Baidu
RELATED PARTY TRANSACTIONS AND BALANCES
Loan and interest to related parties	$ 100,000,000	¥ 650,000,000
Repayment of entrusted loan and interest from related parties							652,299,803
Commissions to related parties						80,474,320	96,056,853
Online marketing service from related parties						38,015,114	110,064,311		89,244,042
Repayment of entrusted loan and interest to related parties							1,837,384,234
Term of the loan	12 months	12 months
Interest rate on loan (as a percent)	1.00%	1.00%
Due from related parties, current							408,834,667					118,564,122
Due to related parties, current							293,579,066					58,287,646
Baidu \| Qunar
RELATED PARTY TRANSACTIONS AND BALANCES
Loan and interest to related parties								$ 100,000,000	¥ 650,000,000
Term of the loan								1 year	1 year
Outstanding balance related to business cooperation agreement							409,000,000					119,000,000
Debt instrument term								3 years	3 years
Principal loan amount									¥ 1,100,000,000
Skysea
RELATED PARTY TRANSACTIONS AND BALANCES
Loan and interest to related parties						4,346,586	73,399,675		15,826,363	$ 80,000,000
Interest rate on loan (as a percent)										3.00%
Provision for the loan and receivable												536,000,000
Due from related parties, current							132,035,460
Due from related parties, non-current							599,913,241					195,615,163
Other payables and accruals												367,000,000
LY.com
RELATED PARTY TRANSACTIONS AND BALANCES
Commissions to related parties						¥ 70,208,452	62,150,144		¥ 75,297,659
Due from related parties, current							96,308,665					57,808,027
Others
RELATED PARTY TRANSACTIONS AND BALANCES
Due from related parties, current							18,043,311					44,578,151
Due from related parties, non-current												22,738,196
Due to related parties, current							¥ 37,381,264					¥ 86,732,455
Baidu Times \| Qunar
RELATED PARTY TRANSACTIONS AND BALANCES
Interest rate on loan (as a percent)			4.14%
Loan granted by related parties			$ 99,000,000										¥ 640,000,000
Debt instrument term			12 months
Revolving credit facility agreement \| Qunar
RELATED PARTY TRANSACTIONS AND BALANCES
Drawdowns during the period				¥ 627,000,000	¥ 507,000,000

EMPLOYEE BENEFITS (Details) - CNY (¥) ¥ in Millions	12 Months Ended
EMPLOYEE BENEFITS (Details) - CNY (¥) ¥ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
EMPLOYEE BENEFITS
Expense of employee benefits	¥ 1,600	¥ 1,400	¥ 961

TAXATION - Company's subsidiaries (Details) - CNY (¥)	12 Months Ended						36 Months Ended
TAXATION - Company's subsidiaries (Details) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2017
Taxation
Applicable tax rate (as a percent)	25.00%	25.00%	25.00%
Deferred tax liability provided on the outside basis difference from undistributed earnings	¥ 0						¥ 0
Ctrip Computer Technology
Taxation
Applicable tax rate (as a percent)							15.00%
Ctrip Travel Network
Taxation
Applicable tax rate (as a percent)							15.00%
Ctrip Travel Information
Taxation
Applicable tax rate (as a percent)							15.00%
Hong Kong Profits Tax
Taxation
Applicable tax rate (as a percent)	16.50%
Taiwan Enterprise Income Tax
Taxation
Applicable tax rate (as a percent)	17.00%
PRC Corporate Income Tax
Taxation
Applicable tax rate (as a percent)	25.00%
PRC Corporate Income Tax \| Western region of China \| Chengdu Ctrip
Taxation
Applicable tax rate approved (as a percent)	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%
PRC Corporate Income Tax \| Western region of China \| Chengdu Ctrip International
Taxation
Applicable tax rate approved (as a percent)	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%
PRC Corporate Income Tax \| Western region of China \| Chengdu Information
Taxation
Applicable tax rate approved (as a percent)	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%
PRC Corporate Income Tax \| High new tech enterprises \| Ctrip Computer Technology
Taxation
Applicable tax rate (as a percent)	15.00%
PRC Corporate Income Tax \| High new tech enterprises \| Ctrip Travel Network
Taxation
Applicable tax rate (as a percent)	15.00%
PRC Corporate Income Tax \| High new tech enterprises \| Qunar Software
Taxation
Applicable tax rate (as a percent)	15.00%	15.00%	15.00%
PRC Corporate Income Tax \| High new tech enterprises \| Qunar Beijing
Taxation
Applicable tax rate (as a percent)	15.00%	15.00%	15.00%
PRC Corporate Income Tax \| High new tech enterprises \| Ctrip Travel Information
Taxation
Applicable tax rate (as a percent)	15.00%

TAXATION - Components of domestic and foreign income before income tax expenses (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Income/(loss) from domestic and foreign components before income tax expenses
Domestic		¥ 5,834,384,007	¥ 2,207,474,278	¥ 1,873,383,988
Foreign		(2,327,889,321)	(3,967,579,279)	1,131,979,994
Income/(loss) before income tax expense, equity in income of affiliates and non-controlling interests	$ 538,938,365	¥ 3,506,494,686	¥ (1,760,105,001)	¥ 3,005,363,982

TAXATION - Composition of income tax expense (Details)	12 Months Ended
TAXATION - Composition of income tax expense (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
TAXATION
Current income tax expense		¥ 1,452,424,600	¥ 454,533,605	¥ 383,723,730
Deferred tax expense/(benefit)	$ (26,420,740)	(171,901,260)	23,475,428	86,464,693
Income tax expense	$ 196,812,834	¥ 1,280,523,340	¥ 478,009,033	¥ 470,188,423

TAXATION - Reconciliation of tax rate and components of deferred tax assets and liabilities (Details) - CNY (¥)	12 Months Ended			36 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)	25.00%	25.00%	25.00%
Tax differential from statutory rate applicable to subsidiaries with preferential tax rates (as a percent)	6.00%	8.00%	(5.00%)
Gain on deconsolidation of a subsidiary with a withholding tax rate of 10% versus the statutory CIT rate			(11.00%)
Non-deductible expenses and non-taxable income incurred	4.00%	(50.00%)	6.00%
Change in valuation allowance (as a percent)	2.00%	(10.00%)	1.00%
Effective CIT rate (as a percent)	37.00%	(27.00%)	16.00%
Withholding tax rate (as a percent)	10.00%	10.00%	10.00%
Increase in income tax due to share based compensation charge	¥ 458,000,000	¥ 890,000,000	¥ 161,000,000
Increase in income tax rate due to share based compensation charge	13.00%	(51.00%)	5.00%
Deferred tax assets:
Accrued expenses					¥ 331,524,551	¥ 149,205,615
Loss carry forward					150,575,892	159,747,175
Accrued liability for customer reward related programs					99,188,976	122,635,196
Accrued staff salary					4,018,972	55,228,349
Others					73,875,163	38,782,032
Less: valuation allowance of deferred tax assets	¥ 150,286,773	¥ 31,489,450	¥ 183,449,500	¥ 183,449,500	197,214,279	150,286,773
Total deferred tax assets					461,969,275	375,311,594
Deferred tax liabilities
Recognition of intangible assets arise from business combinations and unrealized holding gain					(3,847,440,251)	(3,607,882,808)
Net deferred tax assets/(liabilities)					(3,385,470,976)	(3,232,571,214)
Movement of valuation allowances
Balance at beginning of year	150,286,773	31,489,450	183,449,500	183,449,500
Current year additions	46,927,506	118,797,323	31,590,648
Deconsolidation of Tujia			(183,550,698)
Balance at end of year	¥ 197,214,279	¥ 150,286,773	¥ 31,489,450	¥ 197,214,279
Operating tax loss carry forwards					662,000,000
Unrecognized tax benefit and accrual					¥ 0	¥ 0
Subsidiaries
Reconciliation of the differences between statutory tax rate and effective tax rate
Effective CIT rate (as a percent)	6.40%	8.20%	(5.30%)
Ctrip Computer Technology
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				15.00%
Effective CIT rate (as a percent)	(1.60%)	4.20%	(1.40%)
Ctrip Travel Information
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				15.00%
Effective CIT rate (as a percent)	(1.60%)	1.90%	(0.40%)
Ctrip Travel Network
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				15.00%
Effective CIT rate (as a percent)	(1.60%)	7.40%	(3.00%)
Chengdu Information Technology Co., Ltd.
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				15.00%
Effective CIT rate (as a percent)	(2.10%)	1.40%	(0.60%)
The Company and its subsidiaries in Hong Kong and Cayman
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				16.50%
Statutory CIT rate alternate case (as a percent)				0.00%
Effective CIT rate (as a percent)	15.40%	0.80%	(0.30%)
Qunar and subsidiaries
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				15.00%
Effective CIT rate (as a percent)	(1.00%)	(5.90%)
Other subsidiaries
Reconciliation of the differences between statutory tax rate and effective tax rate
Statutory CIT rate (as a percent)				16.50%
Statutory CIT rate alternate case (as a percent)				15.00%
Statutory CIT rate alternate case (as a percent)				0.00%
Effective CIT rate (as a percent)	(1.10%)	(1.60%)	0.40%

TAXATION - Effect of preferential tax (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax holiday
Tax holiday effect	¥ 345,292,589	¥ 177,799,057	¥ 162,896,542
ADS
Income tax holiday
Basic net income per ADS effect (in RMB per share)	¥ 0.65	¥ 0.38	¥ 1.08
Diluted net income per ADS effect (in RMB per share)	¥ 0.60	¥ 0.38	¥ 0.86

OTHER PAYABLES AND ACCRUALS (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
OTHER PAYABLES AND ACCRUALS
Accrued operating expenses		¥ 2,851,988,186	¥ 1,549,809,298
Deposits received from suppliers and packaged-tour users		507,158,340	460,648,199
Payable for acquisition and investments (Note 2)		625,682,289	157,004,868
Provision related to an equity method investment (Note 13)		367,448,156
Due to employees for stock option proceeds received on their behalf		197,430,857	250,831,976
Deposit for special bonus program		178,771,740	168,404,481
Interest payable		68,413,048	103,016,365
Accruals for property and equipment		42,444,370	22,855,856
Deferred revenue		31,789,775	12,664,375
Others		225,509,712	124,585,829
Total	$ 783,338,681	¥ 5,096,636,473	¥ 2,849,821,247

LONG-TERM DEBT (Details)					1 Months Ended	12 Months Ended
LONG-TERM DEBT (Details)	Sep. 19, 2016 USD ($) $ / shares	Jun. 18, 2015 USD ($) $ / shares shares	Oct. 17, 2013 USD ($) $ / shares shares	Sep. 24, 2012 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 CNY (¥)	Sep. 12, 2016 USD ($) $ / shares	Dec. 10, 2015 USD ($) item $ / shares	May 26, 2015 USD ($) $ / shares	Aug. 07, 2014 USD ($) $ / shares
LONG-TERM DEBT
Long-term loan \| ¥									¥ 2,550,000,000		¥ 8,807,156,482
Less: Debt issuance costs \| ¥									(184,276,447)		(81,746,715)
Total						$ 4,491,070,926			34,650,673,553		29,220,254,767
Fair value of long-term debt, based on Level 2 inputs						29,300,000,000
Proceeds from sale of warrants \| ¥										¥ 523,404,000
Notes for early conversion						368,221,572	¥ 2,395,760,015		2,604,871,611	¥ 118,973,721
Proceeds from the termination of 2012 and 2013 Purchased Call Option						100,000,000	¥ 650,000,000	$ 12,000,000
Borrowings collateralized by stock at a wholly-owned subsidiary
LONG-TERM DEBT
Aggregate principal amount						$ 1,400,000,000					¥ 8,800,000,000
Borrowings collateralized by stock at a wholly-owned subsidiary \| Minimum
LONG-TERM DEBT
Interest rate (as a percent)						1.90%					1.90%
Borrowings collateralized by stock at a wholly-owned subsidiary \| Maximum
LONG-TERM DEBT
Interest rate (as a percent)						7.00%					7.00%
2018 Notes
LONG-TERM DEBT
Long-term loan \| ¥									5,554,400,000
Interest rate (as a percent)			1.25%
Aggregate principal amount			$ 800,000,000		$ 327,000,000
Debt issuance costs			$ 19,600,000
Notes for early conversion						$ 352,000,000
2018 Notes \| ADS
LONG-TERM DEBT
Initial conversion rate			0.0127568
Initial conversion price (in dollars per share) \| $ / shares			$ 78.39		$ 39.19
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option \| shares					8,300,000
Number of shares issued upon exchange of notes \| shares						10.8	10.8
2018 Notes \| ADS \| Purchased Call Option
LONG-TERM DEBT
Share price agreed to be sold by the counterparty on exercise of Purchased call option \| $ / shares			$ 78.39
2018 Notes \| ADS \| Purchased Call Option \| Long \| Maximum
LONG-TERM DEBT
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option \| shares			10,200,000
2018 Notes \| ADS \| Sold Warrants
LONG-TERM DEBT
Proceeds from sale of warrants			$ 77,200,000
Exercise price of warrants sold (in dollars per share) \| $ / shares			$ 96.27
2018 Notes \| ADS \| Sold Warrants \| Maximum
LONG-TERM DEBT
Number of shares that can be purchased from warrants sold \| shares			10,200,000
2020 Notes
LONG-TERM DEBT
Long-term loan \| ¥									4,860,100,000
Interest rate (as a percent)		1.00%
Initial conversion rate		0.0091942
2020 Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares		$ 108.76
2025 Notes
LONG-TERM DEBT
Long-term loan \| ¥									2,777,200,000		¥ 2,602,520,000
Interest rate (as a percent)		1.99%
Aggregate principal amount		$ 400,000,000
Debt issuance costs		$ 6,800,000
Initial conversion rate		0.0093555
2025 Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares		$ 106.89
2022 Notes
LONG-TERM DEBT
Long-term loan \| ¥									6,769,425,000		6,343,642,500
Interest rate (as a percent)	1.25%
Initial conversion rate	0.0152688
2022 Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares	$ 65.49
2019 Priceline Note
LONG-TERM DEBT
Long-term loan \| ¥									3,471,500,000		3,253,150,000
Interest rate (as a percent)															1.00%
Aggregate principal amount															$ 500,000,000
2019 Priceline Note \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares															$ 81.36
2020 Priceline Notes
LONG-TERM DEBT
Long-term loan \| ¥									1,735,750,000		1,626,575,000
Interest rate (as a percent)														1.00%
Aggregate principal amount		$ 700,000,000												$ 250,000,000
Debt issuance costs		$ 11,300,000
2020 Priceline Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares														$ 104.27
Number of shares that can be purchased from warrants sold \| shares		6,400,000
2020 Priceline Notes \| ADS \| Sold Warrants
LONG-TERM DEBT
Proceeds from sale of warrants		$ 84,400,000
Number of shares that can be purchased from warrants sold \| shares		6,400,000
2025 Priceline and Hillhouse Notes
LONG-TERM DEBT
Long-term loan \| ¥									6,943,000,000		6,506,300,000
Interest rate (as a percent)													2.00%
2025 Priceline and Hillhouse Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares													$ 68.46
2022 Priceline Notes
LONG-TERM DEBT
Long-term loan \| ¥									¥ 173,575,000		¥ 162,657,500
Interest rate (as a percent)												1.25%
2022 Priceline Notes \| ADS
LONG-TERM DEBT
Initial conversion price (in dollars per share) \| $ / shares												$ 65.49
2022 Priceline Notes
LONG-TERM DEBT
Aggregate principal amount	$ 975,000,000											$ 25,000,000
Debt issuance costs	$ 19,000,000
2017 Notes
LONG-TERM DEBT
Interest rate (as a percent)				0.50%
Aggregate principal amount				$ 180,000,000
Debt issuance costs				$ 5,400,000
Notes for early conversion								$ 26,000,000
2017 Notes \| ADS
LONG-TERM DEBT
Initial conversion rate				0.0517116
Initial conversion price (in dollars per share) \| $ / shares				$ 19.34
Number of shares issued upon exchange of notes \| shares								2.6	2.6
2017 Notes \| ADS \| Purchased Call Option
LONG-TERM DEBT
Share price agreed to be sold by the counterparty on exercise of Purchased call option \| $ / shares				$ 19.34
2017 Notes \| ADS \| Purchased Call Option \| Long \| Maximum
LONG-TERM DEBT
Number of shares agreed to be sold by the counterparty on exercise of Purchased Call option \| shares				9,300,000
2017 Notes \| ADS \| Sold Warrants
LONG-TERM DEBT
Proceeds from sale of warrants				$ 26,600,000
Number of shares that can be purchased from warrants sold \| shares				9,300,000
Exercise price of warrants sold (in dollars per share) \| $ / shares				$ 26.37
Priceline and Hillhouse Notes
LONG-TERM DEBT
Aggregate principal amount													$ 1,000,000,000
Number of affiliates \| item													2

CAPITAL AND TREASURY STOCK (Details)	1 Months Ended		12 Months Ended
CAPITAL AND TREASURY STOCK (Details)	Sep. 30, 2016 USD ($) shares	Sep. 30, 2016 CNY (¥) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2015 CNY (¥) shares	Dec. 31, 2017 CNY (¥) shares
CAPITAL AND TREASURY STOCK
Amount of convertible notes early converted			$ 368,221,572	¥ 2,395,760,015		¥ 2,604,871,611		¥ 118,973,721
Treasury stock delivered to the notes holders, per early conversion (in shares) \| shares			318,170	318,170	330,048	330,048	244,466	244,466
Treasury stock, shares \| shares			2,929,139			3,247,309			2,929,139
Treasury stock at cost			$ 324,427,189			¥ 2,235,574,510			¥ 2,110,820,623
Convertible Senior Notes
CAPITAL AND TREASURY STOCK
Amount of convertible notes early converted \| $			19,600,000		$ 21,600,000		$ 16,500,000
ADS
CAPITAL AND TREASURY STOCK
Issuance cost \| ¥		¥ 226,000,000
ADS \| Over allotment option
CAPITAL AND TREASURY STOCK
Aggregate number of ADS shares \| shares	32,775,000	32,775,000
Additional number of shares \| shares	4,275,000	4,275,000
Aggregate amount of offering price \| $	$ 1,500,000,000
Baidu \| ADS
CAPITAL AND TREASURY STOCK
Aggregate investment amount \| $			100,000,000
Priceline Group \| ADS
CAPITAL AND TREASURY STOCK
Aggregate investment amount \| $			$ 25,000,000

EARNINGS/(LOSSES) PER SHARE (Details)	12 Months Ended
EARNINGS/(LOSSES) PER SHARE (Details)	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares	Dec. 31, 2015 CNY (¥) ¥ / shares shares
Numerator:
Net income/(loss) attributable to Ctrip's shareholders	$ 329,221,145	¥ 2,142,011,537	¥ (1,430,703,195)	¥ 2,507,655,884
Eliminate the dilutive effect of interest expense of convertible notes \| ¥		52,229,311		185,589,773
Numerator for diluted earnings/(loss) per share \| ¥		¥ 2,194,240,848	¥ (1,430,703,195)	¥ 2,693,245,657
Denominator:
Denominator for basic earnings/(loss) per ordinary share - weighted average ordinary shares outstanding	66,300,808	66,300,808	59,166,582	37,797,698
Dilutive effect of share options	2,978,969	2,978,969		2,962,481
Dilutive effect of convertible notes	2,345,083	2,345,083		6,102,417
Dilutive effect of convertible notes sold warrants	151,033	151,033		512,652
Denominator for diluted earnings/(loss) per ordinary share	71,775,893	71,775,893	59,166,582	47,375,248
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	8,381,174	8,381,174	14,047,548	2,385,984
2017 Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share			435,248
2018 Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	2,002,507	2,002,507	2,551,360
2020 Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	1,608,984	1,608,984	1,608,985
2025 Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	935,550	935,550	935,550	486,999
2022 Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	1,860,885	1,860,885	559,282
2019 Priceline Note
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share			1,536,338
2020 Priceline Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share			599,400
2025 Priceline and Hillhouse Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	1,825,838	1,825,838	1,825,838	100,046
2022 Priceline Notes
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	47,715	47,715	14,341
Outstanding weighted average stock options
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share	99,695	99,695	3,678,030	64,074
Sold Warrants
Denominator:
Number of outstanding weighted average ordinary shares excluded from the calculation of diluted earnings /(loss) per common share			303,176	1,734,865
Ordinary shares
Denominator:
Basic earnings/(loss) (in RMB per share) \| (per share)	$ 4.97	¥ 32.31	¥ (24.18)	¥ 66.34
Diluted earnings/(loss) (in RMB per share) \| (per share)	4.70	30.57	(24.18)	56.85
ADS
Denominator:
Basic earnings/(loss) (in RMB per share) \| (per share)	0.62	4.04	(3.02)	8.29
Diluted earnings/(loss) (in RMB per share) \| (per share)	$ 0.59	¥ 3.82	¥ (3.02)	¥ 7.11

COMMITMENTS AND CONTINGENCIES (Details) - CNY (¥)	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) - CNY (¥)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating lease commitments
2018	¥ 263,400,004
2019	188,973,971
2020	98,682,126
2021	66,924,998
2022	53,406,162
Thereafter	178,218,196
Total	849,605,457
Operating lease, rental expense
Rental expense	445,000,000	¥ 378,000,000	¥ 134,000,000
Capital commitments
Outstanding capital commitments	49,000,000
Guarantee
Quota amount of air tickets	1,100,000,000
Deposits paid	133,000,000
Maximum amount of future payments	¥ 931,000,000