Abstract：Objective To understand the characteristics of sexual network of 321 HIV positive MSM and HIV infection status among sexual partners in Zhejiang Province. Methods A cross-sectional study selected HIV positive MSM diagnosed between September，2015 and September，2016 were conducted in Hangzhou，Ningbo，Wenzhou in Zhejiang Province using self-administrated questionnaire. Information related to socio-demographic characteristics，risky behavior，size of sexual network were collected. Results A total of 321 HIV positive MSM were recruited in this study. 71.76% aged 20 to 40 years old and 51.71% were native. The rate of self-reported sexual behavior with stable homosexual partners，casual homosexual partners，spouse and other heterosexual partners at investigation were 37.78%，45.00%，36.56% and 66.67%. The rate of never using condom with stable homosexual partners，casual homosexual partners，spouse were 27.91%，16.36% and 44.00%. HIV positive rate among stable homosexual partners，casual homosexual partners，spouse and other heterosexual partners were 28.26%，3.77%，11.43% and 0.00%. Conclusion The size of sexual network was large，especially in casual sexual network. Unsafe sexual behavior，like consistent condom use was low and multiple sexual partners . HIV infection was high among stable homosexual partners and spouse.
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