HIV infection, if not after systematic and regular treatment, after the development of AIDS stage, the harm to people is mainly HIV invasion of the human body’s immune system. Especially CD4T lymphocytes, resulting in the human body can not defend against a variety of pathogens infected, originally existed in the human body does not cause disease pathogens proliferate, invade the human body organs, tissues, cells or lead to the human body to develop a variety of uncommon tumors, the human body will appear a variety of clinical symptoms. In the final stage of development, the human body is consumed by the disease and suffers from serious weight loss, thinness, darkness and lifelessness, and finally dies from various complications caused by infection or tumor.