According to hospital studies, the short-term morbidity and mortality rate (30d morbidity and mortality rate) of hospitalized patients with severe pneumonia can even reach about 50%, which can be prompted by the susceptibility of the population and their own immunity. Severe pneumonia is a critical illness in the emergency department or respiratory medicine department, mostly developed from infectious pneumonia like bacteria such as Gluconococcus aureus, Pseudomonas aeruginosa, etc. In the early stage, it can show fever, cough, respiratory difficulties, etc. If the population is old, has low immunity, or suffers from various systemic diseases, it is easy to lead to the deterioration of the condition and the development of severe pneumonia. Once severe pneumonia develops, it is clinically difficult, which not only increases the mortality rate, but also greatly increases the economic and medical burden of patients. Patients should be admitted to the intensive care unit for close monitoring and treatment.