Hepatitis B virus DNA is normal in the following three cases: I. There is no infection of hepatitis B, or the infection of hepatitis B has been completely cleared at present. Hepatitis B surface antigen is positive, but hepatitis B virus DNA is normal, at this time, hepatitis B is in a relatively stable stage, the virus replication is not active. Third, hepatitis B surface antigen positive is after antiviral treatment of people, if it is without antiviral treatment of hepatitis B surface antigen carriers, although the current condition is stable, it is still recommended to review the hepatitis B viral DNA, liver function and hepatitis B five items after six months. If the patient is receiving antiviral treatment for hepatitis B, it is recommended to continue to take antiviral drugs for treatment and to review regularly.