Influenza vaccine is to prevent epidemic cerebrospinal meningitis of influenza, is a more dangerous and serious disease. Once infected, patients will show headache, fever, severe patients may have sequelae of drainage, may lead to patients with low intelligence, there are other adverse reactions, so all children in our country should be vaccinated to prevent the occurrence of rheumatic brain disease. Early vaccination should be able to reduce the incidence of rheumatic encephalopathy, and after vaccination, antibodies will be produced in the body to prevent rheumatic encephalopathy, and according to the national immunization program, rheumatic encephalopathy vaccination should be carried out at the earliest possible time. There may be some side effects after the vaccination, the main adverse reactions are local adverse reactions, such as redness and swelling of the injected skin, and pain and discomfort, some children may also have systemic adverse reactions, such as persistent fever, the body temperature may exceed 38℃, but do not worry too much, give the temperature down in time and pay more attention to observation.