As of February 9, 2023, the global epidemic of COVID-19's disease has lasted for nearly two years. Globally, more than 240 million people were infected and 4.9 million people died because of COVID-19. The first wave of global epidemic peak appeared from 30 February to 202 1 day in 2020, and the second wave appeared on 202 1 day. It can be seen that almost every time people think that the epidemic will gradually ease, there will be a new wave of counterattack in COVID-19. However, with the continuous improvement of vaccination rate and the absence of new noteworthy mutations in COVID-19 for a long time, the number of newly confirmed cases and deaths in the world showed a continuous downward trend.