RESUMEN
<p><b>OBJECTIVE</b>To provide the basis for AIDS intervention, the study on the relationship between AIDS related risk behaviors and the related factors was carried out among prostitutes, injection drug users and long-distance truck drivers.</p><p><b>METHODS</b>Questionnaire investigation and statistical analysis as chi(2) test, F test, logistic regression were adopted to analysis the relationship between AIDS related risk behaviors and the correlated factors.</p><p><b>RESULTS</b>Knowledge about AIDS seemed to be related to their level of understanding the problem (in commercial sex workers r = 0.307, P = 0.000, in injection drug users F = 93.07, P = 0.000, in truck man F = 30.06, P = 0.000). Condom use when entertaining their clients last time was related to the knowledge of HIV transmission in commercial sex workers and truck drivers (OR = 1.171, 1.145) and knowledge of HIV prevention (OR = 1.081, 1.397), in drug users regarding gender difference (OR = 2.121).</p><p><b>CONCLUSION</b>This study addressed that the effective means to reduce the rate of AIDS risk behaviors and to lessen the harm of AIDS are to improve the knowledge of AIDS and the effective methods to prevent AIDS in the high risk population.</p>