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PURCHASE ADVANCES, NET - Movement of allowance for doubtful accounts (Details) - Third Party [Member]
6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Jun. 30, 2019
CNY (¥)
Beginning balance $ 35,663 ¥ 248,500 ¥ 452,632
Charge to expense 6,817 47,500 191,473
Less: write-off 0 0 (395,605)
Ending balance $ 42,480 ¥ 296,000 ¥ 248,500