Weak positivity of hepatitis B surface antibody in serum indicates that there is hepatitis B surface antibody in the body, only the titer of antibody is low, the protection against hepatitis B virus becomes weak, and it is necessary to strengthen the injection of a hepatitis B vaccine to increase the titer and enhance the protection. Hepatitis B surface antibody is a protective antibody produced by the body’s immune system in response, making the body less susceptible to infection with the hepatitis B virus. The higher the titer of Hepatitis B surface antibody in the serum, the stronger the protection. If the serum is weakly positive for hepatitis B surface antibody, it means that the titer of antibody becomes low and the protective power to the human body becomes weaker. If hepatitis B surface antibody is weakly positive, it is necessary to take a booster injection of hepatitis B vaccine to increase the titer of hepatitis B surface antibody and enhance the protective power. Vaccination can be given in any vaccination unit with vaccination qualification.