The diameter of the novel coronavirus is about 100 nm. The novel coronavirus belongs to the beta genus of coronaviruses, with a diameter of 80-120 nm and an average of 100 nm, with an envelope, and the novel coronavirus particles are spherical or oval. The reproductive capacity of the novel coronavirus is very strong, more than twice as strong as that of the general coronavirus. When the novel coronavirus enters the human body, its reproductive virus can be found in the epithelial cells of human respiratory tract after 96 hours. The new coronavirus is very contagious and infectious very fast, and there is no specific group of people who are susceptible to the new coronavirus, whether they are old and frail, or strong and young people. Therefore, people should strengthen personal protection in their life and work, and avoid the mentality of luck.