This paper used novel coronavirus pneumonia novel coronavirus pneumonia to analyze the asymmetric transfer of mainland China's A stock returns during the period of new crown pneumonia. The study used E-GARCH model to study the asymmetric transfer of mainland A stock returns during the period from 01 to 01 2021 to 04 2021 21. The empirical results show that the RMB appreciation has a significant one-way effect on the sb64 Shanghai A-share index (rsb64) by Granger method, which is in line with hypothesis 2. The results of e-garch model and the mean equation show that the reward of RMB appreciation is negative and significant effect on the day before the appreciation of RMB. The results of the estimation of variation equation can be seen that EGARCH asymmetry effect exists, which conforms to hypothesis 3.