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INVESTMENTS (Details)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Investment      
Others   ¥ 56,842,654 ¥ 11,938,400
Total net book value $ 1,865,385,975 11,855,647,100 5,318,756,447
Tujia      
Investment      
Available-for-sale   2,784,302,479  
LY.com      
Investment      
Available-for-sale   2,253,163,385 1,547,844,523
Hanting      
Investment      
Available-for-sale   852,386,094 898,828,511
Easy Go      
Investment      
Available-for-sale   643,186,701 627,905,501
eHi      
Investment      
Available-for-sale   717,027,215 535,024,052
Tuniu      
Investment      
Available-for-sale   313,860,446 216,690,294
Travel agency focusing on teenager market      
Investment      
Available-for-sale     81,000,000
Big-data service company      
Investment      
Available-for-sale     62,046,000
Dining Secretary      
Investment      
Available-for-sale   30,556,000 29,046,000
eLong      
Investment      
Equity method   2,610,521,829  
Mind Education      
Investment      
Available-for-sale   81,000,000  
Happy City      
Investment      
Available-for-sale   36,328,061 35,422,062
Home Inns      
Investment      
Equity method   933,734,378 902,964,928
Skyseas      
Investment      
Equity method   140,002,007 161,828,826
Keystone      
Investment      
Cost method   162,067,851 158,217,350
C2C carpooling platform      
Investment      
Cost method   127,112,000  
Zhong'an Online      
Investment      
Cost method   50,000,000 ¥ 50,000,000
Zamplus      
Investment      
Available-for-sale   ¥ 63,556,000