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Long-term investments (Tables)
 12 Months Ended
Dec. 31, 2024
Long-term Investments  
Schedule of Long-term investments
                       
    December 31,
2023		     December 31,
2024		     December 31,
2024		  
    RMB     RMB     USD  
5.0% Investment in a company in mobile games industry     600,000       600,000       83,468  
5.0% Investment in a company in central processing advertising algorithm services     600,000       600,000       83,468  
Subtotal     1,200,000       1,200,000       166,936  
Less: Impairment loss     1,102,938       1,102,938       153,433  
Total     97,062       97,062       13,503