The difference between symptomatic and asymptomatic patients with new crowns is mainly the presence or absence of symptoms such as cough, fever, and dyspnea, as well as pulmonary imaging. Nucleic acid testing was positive in both symptomatic and asymptomatic patients with new crowns. The difference between the two was that symptomatic patients were associated with symptoms such as cough, sputum, runny nose, sore throat, dyspnea, diarrhea, and loss of smell or taste. In asymptomatic infections, the nucleic acid test is positive, but the patient has no symptoms. Although asymptomatic infected persons are asymptomatic, they are contagious and also require intensive isolation and observation. Some asymptomatic infected patients may develop symptoms during the isolation period and then turn into confirmed cases. In order to effectively prevent new coronavirus infections, living and working environments should be ventilated frequently by opening windows and windows, and routine household disinfection should be done regularly, masks should be worn when going out, and hands should be washed frequently.