The difference between wearing masks and not wearing masks during the epidemic lies in the fact that wearing masks can provide effective protection, which is conducive to reducing the chances of infection of neococcal pneumonia and various types of respiratory infectious diseases, whereas not wearing masks may directly inhale virus-carrying aerosols and droplets, thus increasing the risk of infection. New crown pneumonia is mainly transmitted by respiratory droplets and close contact, wearing a mask helps to block the external pathogenic microorganisms, reducing the chances of infection of new crown pneumonia and other respiratory tract infectious diseases; while not wearing a mask, if you and the new crown virus infected or other respiratory tract infectious diseases infected with people in close proximity, unprotected contact, there will be a greater risk of infection. It should be noted that the medical surgical masks, N95 masks, etc. that meet the national standards should be worn, using the correct and standardized method of wearing masks to ensure that the masks are close to the face and completely cover the mouth, nose and chin in order to play an effective protective role. During the epidemic, it is recommended to do a good job of scientific personal protection, improve health literacy, and develop good habits and lifestyles such as wearing masks, “one-meter line”, washing hands frequently, and public chopsticks system. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.