Hepatitis B virus deoxyribonucleic acid actually means hepatitis B DNA. Hepatitis B DNA is the genetic material of hepatitis B. By testing hepatitis B DNA in the blood, we can reflect the specific load of the hepatitis B virus in the body, which can reflect the infectiousness of the body. If the hepatitis B DNA is high, the infection is strong, and if the hepatitis B DNA is low, the infection is weak. In addition to hepatitis B DNA, hepatitis B virus carriers also need to combine liver function, abdominal ultrasound, quantitative hepatitis B five items, alpha fetoprotein, blood count and other indicators to make a comprehensive analysis. If the liver function is repeatedly abnormal and the level of hepatitis B DNA is relatively high, which meets the indication of antiviral treatment, active antiviral treatment is needed. If the liver function is normal, the morphological structure of the liver is normal, and the indication for antiviral treatment is not met for the time being, regular testing can be performed with periodic rechecking of hepatitis B DNA, liver function, abdominal ultrasound, alpha-fetoprotein, blood routine and other indicators.