The new crown is also known as novel coronavirus pneumonia. Wearing a mask when going out can reduce the chance of contracting the new crown, but it is not 100% preventable, and there are other ways of contracting the new crown, such as contact transmission. Wearing a mask when you go out can reduce the chance of contracting the new crown, but you have to choose the right mask, ordinary masks have no protective effect, you have to choose medical surgical masks, disposable medical masks, N95 masks to be effective. Choose the right mask at the same time also need to wear the mask correctly, in order to improve the effect of infection prevention. Wearing a mask when going out can reduce the chances of contracting a new crown, a single protective measure cannot 100% guarantee that the organism will not be infected with a new crown, the new crown can also be transmitted through contact, such as hands touching objects contaminated with the virus and accidentally touching one’s own mouth, nose, eyes, and other parts of the body, which may result in contact with the virus infection. During an epidemic, it is important to take precautions to minimize the chance of infection by avoiding contact with patients and by minimizing visits to places where there is an epidemic. Tip: In this article, the terms “neocoronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.