According to the clinical classification of the formulation of the program, mild, ordinary patients bed rest, strengthen supportive treatment, ensure adequate energy intake, pay attention to the water electrolyte balance, maintain the stability of the internal environment, pay attention to monitoring the vital signs and changes in the indicators of the examination, and give effective oxygen therapy in a timely manner, with patients with a tendency to severe disease, early antiviral therapy. For severe and critical patients, on the basis of the above treatments, actively prevent and treat complications and underlying diseases, prevent secondary infections, and provide timely organ function support, such as: 1, respiratory support therapy, prone ventilation, pulmonary reanimation, or extracorporeal membrane pulmonary oxygenation (ECMO) when necessary. 2, circulatory support, adequate fluid resuscitation. Circulatory support, improve microcirculation based on adequate fluid resuscitation, and use of vasoactive drugs, hemodynamic monitoring if necessary. 3.Other therapeutic measures, such as anticoagulation therapy, renal replacement therapy, etc.; according to the degree of respiratory distress, chest imaging progress, short-term use of glucocorticoids as appropriate.