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INCOME TAX EXPENSES - Per share effect of tax holidays (Details) - ¥ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
INCOME TAX EXPENSES      
Net income per share effect - basic ¥ 0.06 ¥ 0.02 ¥ 0.14
Net income per share effect - diluted ¥ 0.06 ¥ 0.02 ¥ 0.13