When 84 disinfectant is used correctly and according to the instructions, the new coronavirus is usually inactivated within 30 minutes. 84 disinfectant is a chlorine-containing disinfectant, which can achieve disinfection through the oxidizing effect of hypochlorous acid, the effect of new ecological oxygen, and chlorination to destroy the structure of viral protease and genetic material. Normally viruses are inactivated within 30 minutes after contact with 84 disinfectant. However, affected by the properties of the surface of the object, the concentration of disinfectant, dosage, etc. determine the effect of inactivation of the virus. In infected areas when the virus is attached to objects such as walls, concrete floors, etc., the 84 disinfectant needs to be sprayed strictly at a concentration of 1000 to 2000 mg/L and at a content of 100 to 200 mL per square meter for disinfection, and the virus may be inactivated in more than 30 minutes in general. However, if the configuration concentration is low and the disinfectant spraying usage is not standardized, the virus will not only not be eliminated, but may also retain the ability to infect the human body. Therefore, during the epidemic we must use 84 disinfectant scientifically, to avoid doing useless work can not achieve the effect of protecting personal health.