HIV, or Human Immunodeficiency Virus, also known as the AIDS virus, causes impairment of the immune function of human cells and is the causative factor of the acquired immunodeficiency syndrome, or AIDS. HIV is contagious, present in the body fluids of AIDS patients and carriers, and is mainly transmitted through blood and blood products, sexual contact, and mother-to-child transmission. HIV infection does not cause immediate onset of disease, there is a certain period of incubation, which may range from a few months to a few years. 2~4 weeks after HIV infection is the acute phase, some infected people often have fever, which may be accompanied by headache, diarrhea, enlarged lymph nodes and other manifestations, and most of the symptoms are relatively mild, and the symptoms can be relieved in 1~3 weeks. After the acute phase or without the acute phase directly into the asymptomatic period, can last 6 ~ 8 years, this period of time the patient is infectious but no discomfort. the final stage of HIV infection for the AIDS stage, the patient may have persistent fever for more than a month, weight loss, memory loss and other manifestations, but also can appear in a variety of opportunistic infections and tumors. Currently, the HIV virus cannot be completely eliminated from the body, but can only be maximized to inhibit viral replication and control the progress of the disease. Early detection and active treatment can achieve the purpose of long-term survival of patients. In addition, patients should establish a correct awareness of the disease, actively undergo treatment, maintain a healthy mindset, and avoid infecting others.