The National Health and Family Planning Commission on March 31, 2013, that the city of Shanghai and the province of Anhui found three cases of H7N9 avian influenza infection. As of May 6, 2013, the mainland of China had a total of 129 cases of H7N9 human influenza infection, of which 31 were killed, 42 recovered, and the rest of the patients were seriously at risk. Influenza is an acute respiratory disease caused by the influenza virus. Influenza virus can be divided into A(A), B(B), C(C) three types. Among them, A(A) influenza cases can be divided according to the characteristics of the influenza virus to HxN135 subtypes, H7N9 subtype avian influenza is one of them, and has only been discovered among birds and no human influenza