During the new crown pneumonia epidemic, public places should be disinfected as follows: 1, company telephone: use 75% alcohol to wipe the landline telephone twice a day, which can be increased to four times if used frequently; 2, air conditioning: when the central air conditioning system fan coils are in normal use, disinfect the air supply and return air outlets regularly. If there is an epidemic, the fan should be kept in normal operation, and the exhaust branch should be closed after the evacuation of personnel, and the fresh air exhaust system should be shut down and disinfected after running again for a period of time; 3. Garbage cans: use 75% alcohol or chlorinated disinfectant to disinfect garbage cans twice a day.