The SARS virus is a type of coronavirus for which there is no effective vaccine. The survival of the SARS virus requires certain environmental conditions, such as temperature, humidity and sources of infection and transmission. If the temperature is not available and the surrounding environment is not available, SARS will disappear naturally, but this does not mean that SARS is extinct. If care is not taken to allow the conditions for the spread of the virus to become available again, such as having the right hosts, the right transmission routes and susceptible populations, there is a high probability that SARS will return. Therefore, in the prevention of SARS, we must also pay attention to stay vigilant and do our best to prevent and protect against the disease.