At present, AIDS can be transmitted mainly through sexual contact, blood contact and mother-to-child transmission. 1. Sexual contact: HIV exists in human body fluids such as blood, semen and vaginal secretions. When an AIDS patient or HIV-infected person has unprotected sexual contact, the virus can invade the body and cause disease through the slightest damage caused by the friction of sexual contact. 2. Blood Transmission: When sharing needles with others to take drugs, the importation of HIV-contaminated blood or blood products can also lead to infection. 3. Mother-to-child transmission: Pregnant women infected with HIV can infect their babies through the placenta, the birth canal, bloody secretions, and breastfeeding. 4. Other ways: for example, accepting artificial insemination or organ transplantation from AIDS patients or H IV infected people can also induce infection, in addition to medical personnel can also be transmitted to patients through HIV-contaminated medical equipment during medical operations, resulting in hospital infection.