The sars virus, also known as the SARS virus, did not disappear suddenly, but was gradually brought under control through the combination of certain control measures, effective treatment methods and weather factors. 1. Strong control measures: After the occurrence of SARS, the government took the first time to adopt mandatory isolation and protection measures, which made the spread of the virus gradually become smaller, thus preventing the further large-scale spread of SARS. 2. Effective treatment methods: After the occurrence of SARS, medical personnel actively explored and researched together to develop appropriate medications for symptomatic treatment, timely control of patients’ symptoms and prevention of complications, so as to make the patients’ illnesses cured, and then kill the virus in the cradle. 3. weather factors: due to the occurrence of SARS when the weather is in the period of gradual warming, SARS virus in the high temperature and high humidity environment will increase the speed of inactivation, with the summer temperature rises, the virus is gradually inactivated, so the SARS virus will disappear. To summarize, the disappearance of sars virus is the effective result of joint control by many aspects, and it is not a sudden disappearance.