Hepatitis B is mainly transmitted to others through the following channels: 1. blood-borne transmission Input of whole blood, plasma, serum and its blood products, transmitted to others through blood-borne injections; 2. fetus-borne transmission Pregnant women with toxins vertically transmitted to the fetus through the birth canal, or pregnant women with hepatitis in late pregnancy to the fetus, etc.; 3. medical transmission Transmission caused by incomplete sterilization of medical equipment infected by the hepatitis B virus, improper handling, a 4, sexual contact transmission In recent years, foreign sexual promiscuity, homosexuality, heterosexuality observation, affirming that the sexual transmission of hepatitis B is the main way of transmission of sexual partners; 5, close contact transmission with hepatitis B patients, virus carriers, long-term close contact, saliva, urine, blood, bile, breast milk contaminated apparatus items, and then spread through broken skin, mucous membranes; 6, insect bites transmission tropical The moths and various blood-sucking insects in the tropics and subtropics may play a role in the transmission of hepatitis B.