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TAXATION - Components of domestic and foreign income before income tax expenses (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Income/(loss) from domestic and foreign components before income tax expenses        
Domestic   ¥ 5,834,384,007 ¥ 2,207,474,278 ¥ 1,873,383,988
Foreign   (2,327,889,321) (3,967,579,279) 1,131,979,994
Income/(loss) before income tax expense, equity in income of affiliates and non-controlling interests $ 538,938,365 ¥ 3,506,494,686 ¥ (1,760,105,001) ¥ 3,005,363,982