Abstract: Objective To understand STD/AIDS related knowledge, attitude and behaviors among money boys in Hangzhou. Methods Face to face interview was conducted among money boys recruited through introduction by others. Results Ten money boys were interviewed. The median of their age was 21 years old. Five of them believed they were homosexual, 4 believed they were bisexual and only 1 believed he was heterosexual. Seven of them wanted to get married. They had misunderstanding about prevention of STD/ AIDS, and 7 thought they had no risk to be infected with HIV. About 20% had commercial sex with both males and females. The main risk sexual behaviors included anal sex, oral sex and masturbation. Most of them never used condoms at oral sex, and about 20% of them didn't use condoms in all commercial anal sex in the latest month. Conclusion Money boys are the risk population to transmit HIV, and risk behaviors are common among them, which could result in the transmission of STD/AIDS. Behavioral interventions should be implemented urgently among this population.