Abstract: ObjectiveTo study the situation of sexual and reproductive health of unmarried floating population.MethodsData of the survey on sexual and reproductive health of floating population in 2004 was analyzed with SPSS by descriptive statistical method.Results65% of subjects did not know chancroid was STD and 40.4% did not know pointed condyloma was STD.58.6% of subjects thought mosquitoes'bite was one of routes of AIDS infection.12% of males and 20.8% of females knew about the 14th day before menstruation being the time susceptible to conception.41.6% of males and 36.8% of females thought masturbation was harmful.60% of males and 46.7% of females agreed to provide the unmarried with condoms.49.4% of males and 33.3% of females thought it understandable for a man having no sexual behavior for a long time to go whenching.53 subjects were cohabiting.16.7% of males and 11% of females had sexual behavior in last month before the study.ConclusionUnmarried floating population is lack of sexual and reproductive health knowledge,and reproductive services for them should be strengthened.