There is a general lack of immunity to the novel coronavirus in the population, and the disease can occur in the elderly, young adults and children. The elderly and children should do their daily protection, wash their hands regularly, wear masks outside, pay attention to balanced diet, reasonable nutrition, moderate exercise, keep their living environment clean and keep indoor air circulation. (1) Elderly: Family members should pay more attention to the daily life of the elderly. Be sure to ask the elderly about their diet, sleep and mental condition. Because the onset of the disease in the elderly may be different from the onset of the disease in young people, it is mainly manifested as changes in the state of daily life. (2) Children: In the course of epidemic prevention and control, especially in areas with high intensity of the epidemic, children should go out less, especially to crowded places.