The risk of transmission is small when hepatitis B patients are actively treated and their family members are vaccinated against hepatitis B. If hepatitis B patients are not treated, the hepatitis B virus is actively replicating in their bodies, and their family members are not vaccinated against hepatitis B, the risk of transmission is high. Hepatitis B is mainly transmitted by acute and chronic hepatitis B patients and virus carriers, and its infectiousness is proportional to the amount of hepatitis B virus DNA in body fluids. Hepatitis B can be transmitted from mother to child, blood and body fluids, and sexually. If a pregnant person with hepatitis B does not undergo mother-to-child blockade, it can easily be transmitted to the baby. If family members living together are not vaccinated against Hepatitis B, it can easily be transmitted through blood and body fluids by sharing razors, toothbrushes, etc., as well as through sexual contact leading to infection. Therefore, if there are hepatitis B patients in the family, they should actively receive treatment to reduce the level of hepatitis B virus DNA in their bodies; if they are pregnant, they should undergo mother-to-child interruption, and all family members should be vaccinated against hepatitis B, in order to effectively reduce the chances of transmission.