Through statement of AIDS , Happening and development, analysison spread way and infections people, discussion of harm and prevent and treatment. Social ethics problem involved is discussed, and it's showed that AIDS is not only a kin of natual disease, but also a kind of serious social disease and is arise many social ethics problems, women and children will be focal point of prevment and treatment, Practical way should be adopted for comprehensive administration about AIDS all over the world to prevent it's spread at all.