Abstract: ObjectiveTo investigate the covering status quo and influencing factors of the HIV/AIDS prevention services in peer education among men who have sex with men (MSM) . MethodsUsing snowball sampling method, MSM subjects were recruited to conduct self-administered anonymous behavior investigation and serological detection from April to October 2014 at a proper fixed location after informed consent in 9 counties (cities or districts) of Mianyang, Sichuan Province.ResultsA total of 1 097 MSM were investigated and their median age was 23 years. Among the participants, 569 cases（51.9%）had high school education level or below, 906 （82.6%） were unmarried. In the past one year, the coverage rate of peer education was 72.6% (796/1 097), the positive rate of anti-HIV was 3.8% (42/1 097), and the positive rate of syphilis was 5.9 % (41/733). The HIV infection rates were 2.4% (19/796) for MSM who received the peer education and 7.6% (23/301) for those who did not (P<0.01); the syphilis infection rates were 5.2%（29/554）and 6.7%（12/179）for the two groups of MSM, respectively (P>0.05). Unconditional logistic regression analysis showed that the possibility of accepted peer education for the participants whose domicile was other counties in this city or other areas in this province were 0.390 times or 0.420 times that for those whose domicile was in this counties/areas; the possibility of accepted peer education for the participants whose number of local MSM friends >10 was 4.591 times that for those whose number of local MSM friends ≤10; for the participants who sought sexual partners in other areas of this city/province was 2.719 times that of those who did it in the counties/areas where they were living; for the participants who sought sexual partners through the internet was 0.510 times that for those who did it through other ways; the participants who had anal sex ≥twice in the past one week was 2.280 times that for those who had anal sex less than once in the past one week; for the participants who had protected anal intercourse in the last 6 months was 4.228 times that for those who did not; and for the participants whose HIV test was positive was 0.186 time that for those whose HIV test was negative (all P<0.05). ConclusionThe coverage rate of MSM peer education was imbalanced in different areas. Peer education promoted awareness of HIV/AIDS knowledge and safe sex behavior effectively, reduced the risk of HIV infection, and should be strengthened.