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PREPAYMENTS AND OTHER CURRENT ASSETS (Details)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
PREPAYMENTS AND OTHER CURRENT ASSETS
Prepayments and other deposits		¥ 4,575,682,047	¥ 5,082,058,275
Receivable from loans to the users		563,531,742	87,773,083
Prepaid expenses		424,602,556	439,983,044
Receivables from financial institution		96,066,261	207,182,863
Others		512,382,566	389,988,421
Total	$ 948,659,787	¥ 6,172,265,172	¥ 6,206,985,686

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other deposits that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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