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TAXATION - Composition of income tax expense (Details)
12 Months Ended
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