Whether the hepatitis B half-pair can be decreased is mainly about whether the quantitative amount of hepatitis B virus DNA will be decreased or not, and for patients with strong autoimmunity it is possible to have an automatic decrease in the quantitative amount of hepatitis B virus DNA. Hepatitis B two half is used to screen whether the examinee carries the hepatitis B virus or has antibodies to the hepatitis B virus. If the patient carries the hepatitis B virus, it is generally recommended that the patient be further examined for the quantification of the hepatitis B virus DNA to determine whether it is contagious, and when the patient is more contagious, the patient can be treated by the use of antiviral and hepatoprotective medications, to achieve a decrease in the amount of viruses or the amount of viruses to the negative purpose. There may also exist some patients who have strong immunity and the viral load will drop automatically without medication. It is recommended that patients who are found to be carrying hepatitis B virus should be treated actively to avoid infecting others and undergo regular checkups for hepatitis B virus.