At present, the vaccine against hepatitis A is mainly inactivated hepatitis A vaccine, which is intended for children and adults aged above one year old and needs to be vaccinated twice, with an interval of at least half a year between the two injections. Hepatitis A vaccine can stimulate the body to produce anti-hepatitis A virus immunity, mainly used for the prevention of hepatitis A. It belongs to the national immunization plan vaccine, and people over one year old who have not been infected with hepatitis A virus can be vaccinated for free. The vaccine needs to be vaccinated twice, that is, it needs to be reinforced once after half a year after vaccination to be considered as completing the complete immunization program, which plays a certain protective effect and the protection period is more than 20 years. In addition, patients should drink more water, pay more attention to rest and avoid exertion after hepatitis A vaccination. Meanwhile, patients should avoid getting wet for 1 week after injection, and use iodophor to disinfect the injection site if necessary to avoid infection. Some patients may have fever after vaccination, which is normal and no need to worry too much, physical cooling can be taken.