The high rate of same-sex transmission of HIV mainly refers to the high rate of transmission between men who have sex with men, and is related to the way men have sex with men. AIDS is an infectious disease, and its main modes of transmission include blood transmission, sexual transmission and mother-to-child transmission. Sexual intercourse between men of the same sex, mainly through the anus, is prone to anal injury and localized rupture of skin and mucous membranes, which increases the risk of blood transmission; and since men of the same sex do not need to take into account the possibility of pregnancy when having sexual intercourse, they usually do not choose to wear condoms, which further increases the risk of blood and sexual transmission, resulting in an increased chance of spreading the disease. Once diagnosed, AIDS is incurable and patients often die due to a series of complications caused by immunocompromise. Therefore, it is important to take precautions in life, refusing to have blood transfusions of unknown origin, refusing to share needles and refusing to have sexual intercourse in an unhygienic manner can effectively prevent the virus from being contracted.