Abstract: Objective To analyze STD/AIDS related cognition of risk behavior and the healthy state of sexrepr oduction with HIV and HBV in Xintai county.Methods It was investig ated according to the knowing condition of AIDS prevention and treatment knowledge that China established.Demographic data and the information such as STD/AIDS related knowledge and condom use were collected,and collected blood to test HIV/HBV and syphilis serum antibody Physical examination of STD and reproduction health was examiaed by STD special doctor.Results Of all 309 investigated unlicensed prost itudes,32.71% was married,60.84% was unmarried,and 7.44% was divorced and spouse.The rate of people younger than 20 years old,and between 21 and 30 was 18.44% and 55.33% respectively.The rate of condom use during the last sexual contact and the AIDS knowledge-knowing was 95.79% and 72.81% respectively.The positive rate of syphilis serum antibody and HBsAg was 0.97% and 10.67% respectively.No HIV positive was detected while vaginitis and cervical erosion had the percentage of 11.65%,and condyloma acuminate was 0.97%.Conclusion Manyactions had made to unlicensed prostitutes in recreation places and the knowledge level of AIDS prevention and treatment be improved at some extent,but HIV/AIDS unsafe behavior still appeared.It was necessary to intervene and controll continuously and effectively the transmission of HIV/AIDS by sexual contact because a higher rate of infection with HBV and HIV occursed and it was irregular to seek the doctor.