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TAXATION - Valuation allowance (Details)
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
TAXATION      
Beginning Balance ¥ 123,882,503 $ 17,961,276 ¥ 302,834,095
Decrease in valuation allowance (35,200,000) (5,109,692) (178,951,592)
Ending Balance ¥ 88,639,938 $ 12,851,584 ¥ 123,882,503