Abstract: A quantitative study was conducted among university students in Beijing in 1997-1998 to examine students 'knowledge about STDs/AIDS, perceived susceptibility to and severity of STDs/AIDS and premarital sexual behavior. The findings show that more than ninety percent of the respondents ever heard of AIDS, go norrhea, and syphilis, but their knowledge about the transmission of the common STDs and AIDS as very limited. More than half of the surveyed students perceived relatively high susceptibility to and severity of STDs/AIDS. 15% of males and 13% of females admitted having had premarital sexual inter course, but only 9.1% of them reported using acondomat their first inter course. In addition, 3.6% of the respondents answered having had a STD. The sefindings reveal that the reisa need for geater emphasis on comprehensive STDs /AIDS education directed at university students in Beijing.