The new crown pneumonia is an acute respiratory infectious disease, so from the perspective of infectious diseases, from the source of infection, cut off the transmission pathway, to protect the susceptible population of these three aspects of protection: 1, from the source of infection, once the patient is found try not to contact with it, to achieve early detection, early treatment, early isolation. 2, from the cut off the transmission pathway, because the new crown pneumonia is mainly through droplet transmission and contact transmission. The main thing is to wear a mask when you go out to avoid droplet transmission, and to wash your hands regularly to avoid contact infection. 3, from the point of view of protecting susceptible people, the main thing is to improve the resistance of the population, usually should eat more fresh vegetables and fruits and protein-rich diet, to ensure sufficient sleep, regular rest and rest time, in order to improve the body’s resistance.