Objective To understand the knowledge of sexual and reproductive health of undergraduates with different nationalities and provide scientific basis for sexual and reproductive health education in the nationalities university.Methods A self-developed questionnaire about sexual,reproductive health and sexual attitude was used to carry out investigation among 2 200 freshman.Results Formal education (family and school) do not become the main source of the sex knowledge; there were statistic significance of the comparison of sexual,reproductive knowledge and sexual attitude among minority undergraduates and Han nationality undergraduates,as well as among undergraduates from different minorities.Conclusions The undergraduates are thirsty for gaining general sexual knowledge from school and family during the period of university.It is necessary to improve sexual and reproductive knowledge through various ways for minority undergraduates.