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LEASES - Lease cost (Details)
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
LEASES      
Operating lease cost ¥ 4,254,040 $ 616,778 ¥ 4,220,789
Cost of other leases with terms less than one year 87,329 12,662 62,430
Total ¥ 4,341,369 $ 629,440 ¥ 4,283,219