Background Men who have sex with men (MSM) in China remain at high risk for HIV infection,the proportion of reported HIV/AIDS cases that occurred among MSM rose greatly from 2005 to 2011.HIV testing and counseling is a critical HIV prevention strategy among HIV related high-risk population,including MSM in China.This article aimed to assess the association between receiving HIV testing and high-risk sexual behaviors among MSM in Langfang,Hebei Province,China.Methods Between September and November 2007,233 MSM were recruited to receive an HIV testing intervention.Face-to-face interviews were conducted before HIV testing and 3 months later HIV-related risk behaviors were assessed.Serological testing for HIV and other sexually transmitted infections (STIs) was performed.Results Of the recruited 233 MSM,200 completed follow-up.Baseline prevalence was 7.8％ for HIV,21.0％ for syphilis,15.8％ for gonorrhea,and 5.0％ for chlamydia.Multivariate analysis indicated that inconsistent condom use (OR=7.9,95％ CI:0.9-66.7,P=-0.059) and bleeding during anal sex (OR=5.9,95％ CI:1.3-26.2,P=0.019) were risk factors for HIV infection,and group sex (OR=6.6,95％ Cl:2.2-19.7,P=-0.001) was a risk factor for syphilis infection at baseline.At 3 months follow-up,among STI-positive MSM,self-reported anal sex fell from 73.1％ to 38.5％ (P ＜0.001); group sex fell from 19.2％ to 5.8％ (P ＜0.001); and bleeding during anal sex fell from 23.1％ to 5.8％ (P ＜0.001).Among STI-negative MSM,the frequency of one-night stands fell from 32.5％ to 17.2％ (P ＜0.001),and oral sex rose from 57％ to 78.5％ (P ＜0.001).STI-positive MSM were less likely to engage in anal sex compared to STI-negative MSM (x2=5.189,P=0.023).Conclusions HIV testing is an important intervention strategy among MSM.HIV testing services among MSM need to be scaled up,along with comprehensive,tailored interventions including condom promotion and STI treatment.