PRINCIPAL RISKS (Tables)

12 Months Ended

Dec. 31, 2021

PRINCIPAL RISKS

Schedule of suppliers account for 10% or more of total cost of materials

	For the year ended December 31,
Supplier	2019	2020	2021
	RMB	RMB	RMB	US$
A	265,014	196,886	*	*
B	*	*	*	*
C	*	*	*	*
D	*	194,838	*	*

*     Accounts for less than 10% during the period.