Abstract
Since the end of 2019, novel coronavirus has started to spread around the world and continue to mutate. From the initial Alpha to Delta and Omicron, it continues to affect our economic, social and spiritual life. In the process of prevention and control of COVID-19, many people are constantly questioning the prevention and control measures taken in China, such as wearing masks when going in and out of public places, washing hands frequently when going out and back home, regular disinfection in public places, the necessity of building large-scale shelter hospitals, fixed-point isolation of close contacts and infected persons, and universal vaccination. In this paper, the mathematical models, Si, Sir, SEIR, SEIRD, are used to scientifically reveal the transmission link and future development trend of novel coronavirus; At the same time, through mathematical analysis, the necessity of the above new crown epidemic prevention measures is explained in detail.
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