To survey the knowledge level,attitude and behaviors on AIDS among STD clinic clients and explore both health education and prevention procedures for AIDS control. Methods: A total of 454 cases of outpatients were interviewed about the knowledge,attitude of AIDS and the AIDS related risk behaviors. Results: Only 21.37% of all the patients answered all questions correctly;78.63% of all the participants learned AIDS knowledge from newspapers,magazines,television programs and intemet, but 82.16% of them to express that they prefer to studying th...