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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2022
Credit Loss, Additional Improvements [Abstract]  
Schedule of accounts receivable consisted
   As of 
   December 31,
   December 31,
 
   2021   2022 
   RMB   RMB   US$ 
Accounts receivable   88,228,296    32,098,662    4,608,830 
Allowance for doubtful accounts   (682,905)   (1,185,328)   (170,193)
Total accounts receivable, net   87,545,391    30,913,334    4,438,637 

 
Schedule of allowance of doubtful accounts
   As of 
   December 31,
   December 31,
 
   2021   2022 
   RMB   RMB   US$ 
Beginning balance   240,199    682,905    98,054 
Addition   442,706    700,505    100,580 
Write off   
-
    (198,082)   (28,441)
Ending balance   682,905    1,185,328    170,193