AIM:The purpose of this study was to broadly assess the level of knowledge, attitude and behaviors related to sexual and reproductive health (SRH) among unmarried female migrants in China. MATERIAL AND METHODS:This cross-sectional study was conducted and a self-administered questionnaire was designed for collecting information on SRH including 15 items for knowledge, 8 items for attitude and some items for contraception and abortion related behaviors. RESULTS:A total of 1690 unmarried female migrants were interviewed. Most of the respondents had less knowledge of SRH. Only one-third of respondents was aware of emergency contraceptives and could freely talk about SRH with their friends. Over one-third of respondents were not willing to come into contact with someone with AIDS or STDs. In this study, 10.4% participants had an unwanted pregnancy and 95% of them had an abortion. Multivariate analysis showed that having a boyfriend, duration of employment in city, knowledge on SRH and freely discussing SRH with peer were associated with having premarital sex among these unmarried female migrants. CONCLUSION:This study revealed that the unmarried female migrant was one of the most vulnerable groups concerning SRH. In some policy reforms, appropriate and cost-effective SRH services should be provided for these migrants.