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RIGHT-OF-USE ASSETS AND LEASES LIABILITIES (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Jan. 01, 2019
Right of Use [Line Items]          
Carrying amounts of right-of-use assets ¥ 0 ¥ 32,619,000 ¥ 32,619,000   ¥ 17,266,000
Depreciation charge of right-of-use assets 13,082,000 12,187,000      
Interest expense 2,748,000 315,000 ¥ 0    
Total cash outflow in financing activities for leases 14,841,000 13,902,000      
Right-of-use assets [member]          
Right of Use [Line Items]          
Carrying amounts of right-of-use assets 58,458,000 5,078   ¥ 5,078 ¥ 17,266,000
Depreciation charge of right-of-use assets 13,082,000 12,187      
Interest expense ¥ 2,746,000 ¥ 315