Hepatitis B vaccination is one of the national free vaccination programs, which is provided free of charge in the vaccination program for children born at 0, 1 and 6 months of age. If the amount of hepatitis B surface antibody is low in the follow-up examination and further hepatitis B vaccination is required, its hepatitis B vaccination is self-funded. Hepatitis B vaccination needs to be decided according to the quantification of hepatitis B surface antibody. If the hepatitis B surface antibody is below 10, hepatitis B vaccination is required according to 016; if the hepatitis B surface antibody is between 10 and 100, one hepatitis B vaccination is required; if the hepatitis B surface antibody is greater than 100, no hepatitis B vaccination is required, and the potency of hepatitis B surface antibody is observed by regular re-examination.