Influenza virus is a large family, which includes human type A, B and C and animal type A and C. Only influenza A virus can cause transmission between humans and birds. The so-called H7N9 avian influenza virus is an influenza virus whose erythrocyte hemagglutinin and neuraminidase on the surface of the virus consists of H7 and N9, and is prevalent mainly in avian animals. Compared with the common cold, human infection with H7N9 avian influenza disease is characterized by 8 symptoms: 1, rapid onset; 2, early all have high fever (38 ℃ or more); 3, sore throat is not obvious; 4, cough; 5, respiratory distress within a week; 6, further development of severe pneumonia, 7, respiratory failure; 8, high mortality. Since avian influenza is mainly prevalent in birds, people who are often in contact with birds, such as veterinarians and those who have long been engaged in the breeding, trafficking and slaughtering of chickens, ducks and geese, should pay attention to prevention and try to avoid direct contact with sick and dead birds and animals, and pay more attention to stay away from feathers and feces of sick birds. In addition, he advised medical personnel to take the necessary protective measures during the consultation and treatment.