To prevent novel coronavirus infection, a distance of more than 1 meter should be maintained between people. The main transmission route of novel coronavirus is still respiratory droplet transmission and contact transmission, aerosol and fecal-oral transmission routes are yet to be further clarified. Droplet transmission is one of the main modes of transmission of novel coronavirus, and the virus can be dispersed up to 10 meters, but the droplet spray distance of the infectious source is generally 1-2 meters. Therefore, it is important to minimize the risk of novel coronavirus infection by visiting crowded and closed places.