To prevent HIV, we must first start with the mode of HIV transmission. The most common clinical modes of HIV transmission are sexual transmission, blood transmission, and mother-to-child transmission. In clinical practice, patients should strictly avoid high-risk sexual behavior, do not go to irregular medical institutions for invasive operations, such as blood transfusion, blood donation, tooth extraction, abortion, must go to regular medical institutions to carry out, patients must eliminate the occurrence of drug use. At present, there is no particularly effective clinical method to completely remove HIV from the body. The most common clinical method is the highly effective anti-retroviral therapy, which can only inhibit the replication of the virus and try to give the patient a more normal life expectancy, but cannot completely remove the HIV virus and needs to be taken for life.