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CONTRACT ASSETS, NET - Movement of impairment of contract assets (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Jun. 30, 2019
CNY (¥)
CONTRACT ASSETS, NET      
Beginning balance $ 23,279 ¥ 162,213 ¥ 395,604
Reversal of expense (2,723) (18,976) (233,391)
Ending balance $ 20,556 ¥ 143,237 ¥ 162,213