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PREPAYMENTS AND OTHER CURRENT ASSETS (Details)
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Derivative [Line Items]          
Value-added tax deductable ¥ 286,198,731   ¥ 443,761,055    
Deposit for customer duty, bidding and others 154,023,704   93,536,791    
Assets held for sale related to land use right   38,832,489    
Prepayment for income tax 24,323,033   29,879,013    
Receivables related to land use right disposal 23,172,107   20,435,188    
Prepaid Commision 2,013,070   18,970,826    
Prepaid insurance premium 19,237,805   16,851,945    
Rental deposit and prepayment 5,897,704   4,297,689    
Employee advances 8,584,936   7,285,193    
Receivables of option exercised 6,135,783   10,210,003    
Derivative assets   7,277,406    
Prepaid professional service fee 4,095,436   4,057,488    
Receivable related to disposal of subsidiaries (note 1) 185,380,069      
Others 47,581,875   20,053,820    
Total 766,644,253 $ 110,419,740 715,448,906    
Foreign exchange call spread combined option contracts [Member]          
Derivative [Line Items]          
Derivative assets   ¥ 7,277,406
Maturity period of derivative 12 months