Virus invasion of the human body is in search of a more suitable living environment, so the survival conditions are the most suitable living environment. The new coronavirus will be much less active in dry or too cold or too hot places, and the longest survival period is now found to be 9 days abroad. For the virus, it needs to find an organism to proliferate and keep itself alive, and it is not excluded that the virus crystals can infect the human body. So environmental disinfection is very important, the virus is not very tenacious, ultraviolet light, ordinary sunlight can be inactivated, other disinfectants can also kill the virus.