Abstract: Objective To analyze the awareness of AIDS knowledge, behavior characteristics and the epidemic trend of HIV infection among men who have sex with men （MSM） in Xi'an City, so as to provide the basis for formulating AIDS prevention and control strategies. Methods Through a cross-sectional sentinel survey of MSM from 2016 to 2019, questionnaire investigation and serological tests were performed by NGO from April to July every year. Logistic regression analysis was used to analyze the influencing factors of AIDS awareness. Results A total of 1600 cases were investigated, with average age of （28.78 ± 8.48）years.Of the participants, 79.31% were Shanxi registration, 79.06% were unmarried, 77.75% had junior college degree and above, and 75.25% were homosexual, up to 95.06% made friends through the internet and software. The awareness rate of AIDS knowledge was 91.38%. 41.1% of MSM who answered correctly about the condom question showed separation of knowledge and behavior. The awareness rates of AIDS among MSM with high school or secondary specialized school education （OR= 3.279）, junior college or above （OR= 4.738） were higher than that of junior high school and below. Heterosexual （OR=0.240） was lower than homosexual. The incidence of condom use in anal sex, condom use in commercial homosexual sex, proportion of heterosexual sex in the last six months and the proportion of sexually transmitted diseases diagnosed in the last year were on the rise, and condom use in heterosexual sex in the last six months and intervention in the last year were in decline. Conclusion Propaganda should be strengthened for middle-aged and elderly, married MSM in floating population gathering areas and fixed places, personalized intervention service package should be purchased, STD diagnosis and treatment services should be standardized, and an internet model for MSM intervention should be explored.

Key words: AIDS, MSM, Knowledge, attitude and behavior, Influencing factor