Hepatitis B surface antibody is one of the five items of hepatitis B, including hepatitis B surface antigen, hepatitis B surface antibody, hepatitis B core antigen, hepatitis B E antigen, hepatitis B E antibody, in which hepatitis B surface antibody is qualitatively positive, indicating that it may be one of the following two situations: the first one is that one has been injected with the hepatitis B vaccine and got protective antibody; the second one is that one has been exposed to the hepatitis B virus, and has reached the goal of curing the virus through treatment or own immune clearance. In the second case, the exposure to hepatitis B virus has been cured through treatment or autoimmune clearance, and the surface antigen of hepatitis B has become negative, and surface antibodies to hepatitis B have emerged. At this time, if the core antibody is positive at the same time, it suggests that the cure has been improved, and if the E antibody remains positive, it is necessary to continue regular review.