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Convertible notes payable (Tables)
12 Months Ended
Dec. 31, 2024
Convertible Notes Payable  
Schedule of Convertible notes payable
               
   December 31,
2023
   December 31,
2024
   December 31,
2024
 
   RMB   RMB   USD 
Investors   -    149,090,866    20,740,480 
Total   -    149,090,866    20,740,480