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Property and equipment, net (Tables)
12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment, net
                       
    December 31,
2023
    December 31,
2024
    December 31,
2024
 
    RMB     RMB     USD  
Office electronic equipment     37,520       20,448       2,845  
Office fixtures and furniture     139,119       147,312       20,493  
Vehicles     1,201,452       1,201,452       167,137  
Leasehold improvements     271,572       -       -  
Subtotal     1,649,663       1,369,212       190,475  
Less: accumulated depreciation     (899,711 )     (923,842 )     (128,518 )
Total     749,952       445,370       61,957