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CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - STATEMENT OF CASH FLOWS (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
$ / ¥
Dec. 31, 2019
CNY (¥)
$ / ¥
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities $ 86,266,016 ¥ 600,566,742 ¥ 5,354,151 ¥ (615,327,191)
Loan to subsidiaries and VIE | ¥       (217,000,000)
Net cash used in investing activities (442,382,861) (3,079,780,993) 412,870,517 (10,809,388)
Dividend paid (14,823,319) (103,196,981)    
Net cash provided by (used in) financing activities 389,437,812 2,711,188,159 181,789,413 830,154,156
Effect of foreign exchange rate changes 1,525,882 10,622,885 (6,283,113) (24,740,525)
Net increase (decrease) in cash and cash equivalents 34,846,849 242,596,793 593,730,968 179,277,052
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF YEAR 183,531,075 1,277,706,639 683,975,671 504,698,619
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT YEAR END $ 218,377,924 ¥ 1,520,303,432 1,277,706,639 683,975,671
Currency exchange rate | $ / ¥ 6.9618 6.9618    
Parent Company | Reportable legal entity        
STATEMENT OF CASH FLOWS        
Net cash provided by (used in) operating activities $ (1,437,099) ¥ (10,004,797) 36,187,975 15,030,828
Loan to subsidiaries and VIE (28,610,298) (199,179,173) (519,786,600) (69,544,598)
Net cash used in investing activities (28,610,298) (199,179,173) (519,786,600) (69,544,598)
Contribution from shareholders 866,969 6,035,665 681,989,413  
Dividend paid (14,823,319) (103,196,981)    
Net cash provided by (used in) financing activities (13,956,350) (97,161,316) 681,989,413  
Effect of foreign exchange rate changes 1,564,680 10,892,988 (6,283,113) (24,740,525)
Net increase (decrease) in cash and cash equivalents (42,439,067) (295,452,298) 192,107,675 (79,254,295)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF YEAR 44,457,481 309,504,088 117,396,413 196,650,708
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT YEAR END $ 2,018,414 ¥ 14,051,790 ¥ 309,504,088 ¥ 117,396,413
Currency exchange rate 0.1454 0.1454