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COMMITMENTS AND CONTINGENCIES (Details) - CNY (¥) | 12 Months Ended
--- | ---
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 |  |

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