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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capped Call Options [Member]      
Balance ¥ 17,490,323 ¥ 21,098,263 ¥ 107,223,601
Foreign exchange (gain)/loss 736,212 2,562,342 563,725
Change in fair value of capped call options (18,226,535) (6,170,282) (86,689,063)
Balance 0 17,490,323 21,098,263
Convertible Senior Notes [Member]      
Balance 1,506,981,361 1,540,398,645 770,485,897
Issuance of convertible senior notes 0 914,850,000
Foreign exchange (gain)/loss 43,448,795 96,678,461 5,853,455
Change in fair value of convertible senior notes 92,015,957 8,400,918 (150,790,707)
Repurchase of convertible senior notes (1,218,706,405) (138,496,663)
Balance ¥ 423,739,708 ¥ 1,506,981,361 ¥ 1,540,398,645