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PRINCIPAL ACCOUNTING POLICIES (Details 6) | 1 Months Ended | 9 Months Ended |  |
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Jan. 31, 2015 USD ($) | Jan. 31, 2015 CNY (¥) | Dec. 31, 2014 USD ($) | Feb. 28, 2014 USD ($) | Feb. 28, 2014 CNY (¥) | Jan. 31, 2014 USD ($) | Jan. 31, 2014 CNY (¥) | Aug. 31, 2013 USD ($) | Aug. 31, 2013 CNY (¥) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |  |  | ¥ 47,000,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 427,817,481 | ¥ 2,719,036,781 | ¥ 1,892,507,708
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |
Goodwill. |  |  |  |  |  |  |  |  |  | $ 427,817,481 | ¥ 2,719,036,781 | ¥ 1,892,507,708
B2B hotel reservation company |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  | 100.00% |  |
Purchase consideration | $ |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |
Cash payment for acquisition |  |  |  | $ 7,000,000 | ¥ 44,000,000 |  |  |  |  |  |  |
Wholesaler operated hotel reservation and air ticketing services |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest percentage |  |  |  |  |  |  | 49.00% |  |  |  |  |
Purchase consideration | $ | $ 75,600,000 |  |  |  |  |  |  |  |  |  |  |
Online Trip Package Service Provider |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Acquired percentage of issued share capital |  |  |  |  |  |  | 51.00% |  |  |  |  |
Purchase consideration |  |  |  |  |  | $ 23,000,000 | ¥ 139,478,964 |  |  |  |  |
Goodwill |  |  |  |  |  |  | 207,981,890 |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  | 13,176,760 |  |  |  |  |
Deferred tax liabilities, non-current |  |  |  |  |  |  | (9,234,620) |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  | (134,009,200) |  |  |  |  |
Goodwill. |  |  |  |  |  |  | 207,981,890 |  |  |  |  |
Online Trip Package Service Provider | Trademarks and Domain |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  | ¥ 61,564,134 |  |  |  |  |
Offline travel agency |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration | $ |  |  | $ 75,600,000 |  |  |  |  |  |  |  |  |
Travelfusion |  |  |  |  |  |  |  |  |  |  |  |
Business combination disclosures |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest percentage |  | 30.00% |  |  |  |  |  |  |  |  |  |
Purchase consideration |  | ¥ 720,536,040 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 687,633,024 |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  | 36,936,493 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities, non-current |  | (72,293,783) |  |  |  |  |  |  |  |  |  |
Non-controlling interests |  | (275,995,802) |  |  |  |  |  |  |  |  |  |
Goodwill. |  | 687,633,024 |  |  |  |  |  |  |  |  |  |
Travelfusion | Trademarks and Domain |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | ¥ 344,256,108 |  |  |  |  |  |  |  |  |  |

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