The high prevalence of HIV is mainly among young adults.1. Since HIV is mainly transmitted sexually, homosexual patients become a high-risk group for the disease.2. Drug users are vulnerable to HIV infection due to repeated use of unsterilized or incompletely sterilized syringe needles during intravenous drug use.3. Patients with hemophilia require repeated input of clotting factor VIII, otherwise they will bleed due to minor trauma.4. unstoppable. In the process of using clotting factor, there is a greater risk of exposure to infectious agents and vulnerability to HIV infection.4. There is also a proportion of patients who are infants and are associated with HIV-positive mothers who become pregnant without testing, and these mothers may transmit the infection to their infants and children before and after birth through the placenta, birth canal, and breast milk.