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LEASES - Maturities of operating lease liabilities (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
LEASES      
Due within one year ¥ 6,278,361 $ 910,277 ¥ 4,511,953
Due in the second year 5,172,713 749,973 1,780,332
Due in the third year 2,502,839 362,878 882,132
Total lease payments 13,953,913 2,023,128 7,174,417
Less: imputed interest (755,177) (109,491) (300,337)
Total ¥ 13,198,736 $ 1,913,637 ¥ 6,874,080