Objective To investigate the men who have sex with men (MSM) was before and after the intervention changes on AIDS knowledge attitude behavior. Methods The "snowball" in MSM group before and after intervention control survey. Results The MSM group after the intervention of AIDS knowledge knowing rate increased, the correct attitude towards AIDS patients to hold rates increased, partners are not fixed, condoms do not use high risk sexual behavior that significantly reduced, but in sexual behavior did not significantly improve. Conclusion Through intervention, rate, correct attitude, the incidence rate of high-risk be-havior have positive change in AIDS knowledge MSM crowd, but some knowledge rate is still low, sexual behavior and other high-risk behavior is not optimistic, still need to strengthen the comprehensive behavior intervention, to reduce the risk of AIDS with the crowd.%目的：了解男男性接触者（MSM）被干预前后对艾滋病知识态度行为的变化。方法以“滚雪球”方式开展MSM人群行为干预前后的自身对照调查。结果 MSM人群在干预后艾滋病（AIDS）是一种传染病等知识知晓率明显提高（χ2=34.4,P<0.05），对在工作中接触到AIDS病人的正确态度等持有率也明显上升（χ2=17.6,P<0.05），性伴侣不固定、安全套不使用这样的高危性行为明显减少，但在性行为方式上没有明显改善。结论通过干预，MSM人群AIDS知识知晓率、正确态度持有率、高危行为发生率都发生了利好变化，但部分知识知晓率仍然偏低，性行为方式等高危行为不容乐观，仍需加强综合行为干预，降低该人群罹患AIDS风险。
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