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Short-term Investments (Tables)
12 Months Ended
Dec. 31, 2019
Short-term Investments  
Schedule of Short-term investments classification

As of December 31,

2018

2019

2019

RMB

RMB

US$

Debt securities:

Held-to-maturity

    

7,630,689

    

34,481,053

    

4,952,893

Trading

 

 

795,849

 

114,317

Equity securities:

Marketable

 

 

11,925

 

1,713

 

7,630,689

 

35,288,827

 

5,068,923