The diagnostic process for novel coronavirus pneumonia is to confirm a suspected case based on the criteria, and then perform nucleic acid testing, gene sequencing, and antibody assays based on the recommendations in the Diagnostic and Therapeutic Regimen for Novel Coronavirus Pneumonia (7th ed.), with a positive diagnosis in 1 of 3 categories. The diagnosis of a suspected case starts with the 4 criteria of epidemiologic history: 1) whether there is a history of contact with a person infected with novel coronavirus or suspected to be infected within 14 days prior to the onset of the disease. 2) whether there is a history of contact with a person who has tested positive for nucleic acid testing for novel coronavirus infection within 14 days. 3) whether there is a history of contact with persons with fever and respiratory infections in the community of the relevant case report. 4) whether there is a clustering of illnesses and whether there are several persons in the household with similar Symptoms. Clinical manifestations 3 items: 1. Clinical symptoms associated with novel coronavirus infection, such as fever, malaise, and dry cough. 2. Blood counts showing normal or decreased total leukocyte counts and decreased percentage of lymphocytes. 3. Imaging changes characteristic of viral infections on lung CT. If there is an epidemiologic history of 1, the clinical manifestations of 2 of the 3; or no epidemiologic history, the clinical manifestations of the 3 are consistent with the diagnostic criteria for suspected cases, should be reported to the health epidemic prevention department in a timely manner and good home or medical isolation. The diagnosis of novel coronavirus pneumonia is based on the nucleic acid test, gene sequencing and antibody determination of the novel coronavirus in specimens such as nasopharyngeal swabs, sputum or other lower respiratory tract secretions, blood and feces, etc. The diagnosis can be confirmed when the test result is positive.