During the epidemic, a variety of disinfection methods are adopted. We should not only pay attention to the effect of disinfection, but also choose the appropriate disinfection method according to the place, if disinfection should not be carried out in the following situations to avoid excessive disinfection: 1. not to carry out large-scale disinfection of the outdoor environment; 2. not to disinfect the outdoor environment in rainy and snowy weather; 3. not to disinfect the air in the external environment; 4. not to disinfect the whole body of personnel by spraying with disinfectant directly; 5. not to disinfect the water ponds, reservoirs, artificial lakes, etc. in the external environment by throwing disinfectant; 6. not to disinfect the indoor air in the presence of people.