After the novel coronavirus-infected pneumonia situation occurred in Wuhan,China and other areas in December of 2019,the CPC Central Committee and the State Council required the Party committees and governments at all levels must take effective measures to curb the spread of the virus and identify the causes of the virus infection and spread quickly.Although the prevention and control of pneumonia caused by the novel coronavirus has been carried out in full swing all over the country,the spread of the virus has not been blocked,and the pathogenesis and transmission of the virus are not known yet.Thus,the author analyzed the pathogenesis and transmission of the novel coronavirus again,finding that the virus is caused by cold weather,the shared cold weather is the way to spread the epidemic,and the possibility of novel coronavirus infection causing pneumonia is minimal,so there is no need to over consider safety isolation or tight monitoring.