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Short-term investments (Tables)
 12 Months Ended
Dec. 31, 2024
Cash and Cash Equivalents [Abstract]  
Schedule of short term investments consist
                 
    December 31,
2023		     December 31,
2024		     December 31,
2024		  
    RMB     RMB     USD  
Marketable securities     18,411,162       149,583,000       20,808,942  

 

Fair value disclosure:

 

          December 31, 2023  
    December 31,     Fair Value  
    2023     Level 1     Level 2     Level 3  
    RMB     RMB     RMB     RMB  
Marketable securities     18,411,162       18,411,162       -       -  

 

          December 31, 2024  
    December 31,     Fair Value  
    2024     Level 1     Level 2     Level 3  
    RMB     RMB     RMB     RMB  
Marketable securities     149,583,000       149,583,000       -       -