AIDS is not a Class A infectious disease, but a Class B infectious disease. AIDS is a chronic infectious disease caused by human immunodeficiency virus infection, which is rapidly spreading, destructive and difficult to treat. Infection with the human immunodeficiency virus can cause a progressive decline in the body’s immune function and eventually lead to immune failure, causing various opportunistic infections and malignant tumors. At present, there is still no effective treatment for AIDS, so AIDS should pay attention to prevention. China’s Infectious Disease Control Law classifies AIDS as a Class B infectious disease, so we should pay attention to the prevention of AIDS, strengthen AIDS education, timely screening of AIDS patients, timely isolation and timely treatment. At the same time, we should avoid unclean sexual contact and irregular medical operations, and avoid unreasonable blood and blood product transfusions. Effective prevention of AIDS is the most important solution for the treatment of AIDS.