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OTHER RECEIVABLES, NET - Summary of Movement of allowance for doubtful accounts (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jun. 30, 2019
CNY (¥)
Other Receivables [Line Items]        
Charge to (reversal of) expense $ 8,988 ¥ 62,625 ¥ 330,280  
Third Party [Member]        
Other Receivables [Line Items]        
Beginning balance 209,777 1,461,724 ¥ 901,930 ¥ 901,930
Charge to (reversal of) expense (8,988) (62,625)   259,766
Add: reversal of bad debt allowance       300,028
Ending balance $ 200,789 ¥ 1,399,099   ¥ 1,461,724