[目的]了解浦东新区男男性行为者(MSM)艾滋病(AIDS)相关高危性行为及其影响因素,为开展MSM人群的艾滋病防治工作提供建议。[方法]采用横断面研究设计,通过“滚雪球”和网络招募MSM158人,知情同意后进行面对面问卷调查,采集人口学特征、性取向、性伴侣、性行为、性历史等相关信息。[结果]调查对象中同性恋130人(82.3%),双性恋28人(17.7%);在过去的6个月中,97人(61.4%)有过固定的男性伴,80人(50.6%)有过多次性伴,82人(51.9%)有过偶遇性伴;在与不同类型性伴的性行为中,46人(48.4%)曾与固定男性伴、31人(38.8%)曾与多次性伴、33人(40.2%)曾与偶遇性伴发生过AIDS相关高危性行为;性取向、文化程度和婚姻状况是双性性行为发生的主要影响因素,婚姻状况和经济收入是高危性行为发生的主要影响因素,单身和收入较低的MSM更容易发生高危性行为。[结论]MSM人群性伴侣较多,AIDS相关高危性行为发生率较高,应尽快开展有针对性的干预工作。 [Objective] To understand AIDS-related high-risk behaviors of MSM and its influencing factors in Pudong New Area and to provide suggestions for AIDS prevention and control in MSM population. [Methods] Cross-sectional study design was adopted, MSM158 people were recruited through Snowball and network, face-to-face questionnaires were conducted after informed consent, and demographic characteristics, sexual orientation, sexual partners, sexual behavior, sexual history and other related information were collected. [Results] There were 130 homosexuals (82.3%) and 28 bisexuals (17.7%) in the survey; 97 (61.4%) had a fixed male partner in the past 6 months and 80 (50.6% ) Had multiple sexual partners and 82 (51.9%) had occasional sexual partners; 46 (48.4%) had sexual partners with fixed males and 31 (38.8%) had sexual intercourse with different types of sexual partners And multiple sexual partners, 33 (40.2%) had AIDS-related high-risk sexual behaviors with occasional sexual partners. Sexual orientation, educational level and marital status were the main influencing factors of bisexual sexual behaviors. Marital status and economic income were The main influencing factors of high-risk sexual behaviors are single and low-income MSM are more likely to have high-risk sexual behaviors. [Conclusion] There are more sexual partners in MSM population and higher incidence of AIDS-related high-risk behaviors. Targeted intervention should be carried out as soon as possible.