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Concentration (Tables)
 12 Months Ended
Dec. 31, 2022
Concentration [Abstract]  
Schedule of total accounts receivable
    As of     As of  
    December 31, 2021     December 31, 2022  
Customer   Amount     % of Total     Amount     % of Total     Amount  
    RMB     %     RMB     %     US$  
A     18,241,469       20.7 %   *     *     *  
B     13,088,371       14.8 %   *     *     *  
C     9,018,665       10.2 %   *     *     *  
D   *     *       4,393,790       13.0 %     630,875  
E   *     *       4,376,768       13.0 %     628,431  

 

*Represented the percentage below 10%

 
Schedule of total revenue of the customer
   

For the year ended

December 31,

   

For the year ended

December 31,

   

For the year ended

December 31,

  
    2020     2021     2022  
Customer   Amount     % of Total     Amount     % of Total     Amount     % of Total     Amount  
    RMB           RMB           RMB           US$  
B     51,976,003       17.9 %   *     *     *     *     *  
G     45,373,496       15.6 %   *     *     *     *     *  
H     31,095,213       10.7 %   *     *     *     *     *  
F   *     *     *     *       117,415,978       18.0 %     16,864,138  
E   *     *       71,419,145       13.1 %     73,423,394       11.3 %     10,542,371  

 

*Represented the percentage below 10%

 
Schedule of total accounts payable
    As of     As of  
    December 31,
2021		     December 31,
2022		  
Supplier   Amount     % of
Total		     Amount     % of
Total		  
    RMB           RMB        
Cargo Link Logistics HK Company Limited     60,772,958       59.1 %     7,185,007       28.1 %
A   *     *       3,261,998       12.8 %
B     11,676,432       11.4 %   *     *  

 

*Represented the percentage below 10%

 
Schedule of total purchase
    For the year ended     For the year ended     For the year ended
    December 31,
2020		     December 31,
2021		     December 31,
2022
Supplier   Amount     % of Total     Amount     % of Total     Amount     % of Total  
    RMB           RMB           RMB        
C   *     *     *     *       122,901,742       20.0 %
Cargo Link Logistics HK Company Limited     156,091,594       58.0 %     185,858,692       36.4 %     121,455,797       19.8 %

 

*Represented the percentage below 10%