Abstract: In the past 100 years, there have been six outbreaks and epidemics of influenza. Sibamia flu is one of the ten most terrible infectious diseases in history, causing tens of thousands of patients to die. To this end, China has developed a revised version of the 2018 Influenza diagnosis and treatment Plan based on the 2009 / 2011 / 2018 Influenza Diagnostic Plan. Within one year, two diagnosis and treatment plans were formally introduced, which shows that the National Health and Health Commission attaches great importance to the prevention and treatment of influenza in China, and has revised and released the plan in a scientific manner. The etiology, epidemiology, diagnosis basis, treatment principles and treatment methods of influenza are described in this paper. To guide the effective prevention and control of influenza in China accurately, it has feasibility and practicability. The clinical diagnosis and treatment of influenza pneumonia, especially the severe and critical cases, are difficult. CT examination and diagnosis are valuable in the diagnosis and evaluation of the curative effect of influenza pneumonia. Influenza pneumonia had some characteristics, such as: ① glass opacity and pulmonary density shadow, ② multiple lobar lung segments, severe lower lung fields, ③ pleural effusion and / or pericardial effusion, and pericardial effusion. Children with influenza pneumonia should also pay attention to influenza associated encephalopathy and acute necrotizing encephalitis. Imaging features and imaging classification can be helpful for clinical diagnosis, treatment and evaluation of curative Useful help.