There are three main ways of HIV transmission, as follows: 1) blood transmission; 2) sexual contact transmission; 3) mother-to-child transmission. Blood transmission is the most important is the blood transfusion or the use of blood products containing HIV, more common. The sharing of syringes among drug addicts may also lead to the transmission of HIV through the blood route, and the sharing of syringes may lead to the direct transmission of the virus from the blood to the blood of another person through the needle hole. Sexual contact includes heterosexual contact and homosexual contact. From the current epidemiological survey, the proportion of HIV infection from homosexual contact is increasing, which is a matter of concern. It is very important to take protective measures if you are not a single sexual partner or have regular sex with a partner. Mother-to-child transmission includes three processes, the first being prenatal transmission, where the virus can be transmitted from mother to child in utero. The second way is during the delivery process, if there is a break in the mucous membrane of the skin, coupled with the maternal vaginal fluid or blood containing the virus, it may enter the skin of the fetus through the broken skin, resulting in fetal infection. The third area is postpartum transmission, the most common is breastfeeding, improper feeding methods may lead to HIV transmission, in addition, breastfeeding nipple biting or nipple cracking bleeding, oozing, may also lead to HIV transmission.