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SHARE CAPITAL- Principal assumptions used in the valuation (Details)
6 Months Ended
Jun. 14, 2021
CNY (¥)
$ / shares
Feb. 17, 2021
CNY (¥)
$ / shares
Feb. 12, 2021
Jun. 30, 2021
CNY (¥)
Disclosure Of SHARE CAPITAL [Line Items]        
Grant date Jun. 14, 2021 Feb. 17, 2021    
Share price at date of grant 3.15 4.45   1,652,322
Volatility 256.00% 237.00%    
Warrant life 5 years 5 years 5 years  
Dividend yield 0.00% 0.00%    
Risk-free interest rate 0.80% 0.57%    
Fair value at grant date | ¥ ¥ 2.50 ¥ 3.52    
Minimum        
Disclosure Of SHARE CAPITAL [Line Items]        
Exercise price at date of grant ¥ 3.42 ¥ 3.57    
Maximum        
Disclosure Of SHARE CAPITAL [Line Items]        
Exercise price at date of grant ¥ 4.35 ¥ 4.46