The new coronavirus is mainly transmitted through the respiratory route, and the correct wearing of masks can effectively block the droplets and thus prevent the virus. Proper wearing of appropriate masks can effectively block the droplet transmission route to prevent infection. Generally speaking, ordinary disposable masks, cotton masks, activated charcoal masks, etc. do not have the effect of blocking the new coronavirus. Masks used to prevent novel coronavirus should be preferred to medical protective masks, medical surgical masks, or N95 or other high standard protective masks. Before wearing the mask, you need to wash your hands, and after wearing the mask, you need to make sure that there is no air leakage when blowing or inhaling. When the mask is contaminated by blood, body fluids or nasal secretions of the infected person, it should be replaced promptly and immediately. It is also necessary to avoid reusing the mask as much as possible. During epidemics, even if you have completed the New Crown vaccination, you should still wear a mask when you go out and take proper personal protection measures.