A negative nucleic acid test after 14 days in a person with a history of exposure usually rules out novel coronavirus pneumonia. The incubation period of neocoronavirus pneumonia is mostly limited to 14 days. The diagnosis of neocoronavirus pneumonia generally relies on the results of the neocoronavirus nucleic acid test, but also based on the patient’s symptoms, signs, and epidemiological history, as well as on the results of routine blood tests, chest CT, and other tests. There are four main types of neocoronavirus pneumonia, which are light type, common type, heavy type and critical type. For mild patients, the main clinical manifestations are fever, dry cough, malaise, and some patients may also have decreased or loss of smell and taste as the first symptom, and a few patients are accompanied by nasal congestion, runny nose, sore throat, conjunctivitis, myalgia, and diarrhea. Severe patients tend to develop respiratory distress or hypoxemia a week after the onset of the disease, and in severe cases, the disease may rapidly progress to acute respiratory distress syndrome, septic shock, and metabolic acidosis that is difficult to correct.