75% alcohol has inactivating effect on new coronavirus, so it is often used for indoor and outdoor disinfection, but 75% alcohol is flammable, and there are safety hazards if it is not operated properly, and should be avoided to cause fire. The following matters should be noted when disinfecting: 1. It should not be disinfected by spraying indoors, but by wiping, and avoiding alcohol dripping during the wiping process and keeping the room ventilated to avoid fires caused by high alcohol concentration in the air. 2. 75% alcohol is usually used for local wiping of household items, avoiding open flames, especially avoiding smoking. 3. Alcohol should not be sprayed directly on clothes 4.75% alcohol can be sprayed locally when disinfecting outdoors, but it is still necessary to pay attention to the concentration of alcohol in the air and avoid open flames, and cleaning products should be cleaned and dried during use. 5.Storage of alcohol should be kept away from fire, avoid high temperature and direct sunlight, etc.