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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Capped Call Options [Member]    
Balance ¥ 0 ¥ 17,490,323
Foreign exchange loss 0 736,212
Change in fair value of capped call options 0 (18,226,535)
Balance 0 0
Convertible Senior Notes [Member]    
Balance 423,739,708 1,506,981,361
Issuance of convertible senior notes 0 0
Foreign exchange loss/(gain) (842,669) 18,141,799
Change in fair value of convertible senior notes 0 61,620,513
Repurchase of convertible senior notes (422,829,295) (746,775,033)
Balance ¥ 67,744 ¥ 839,968,640