Abstract: Objective To find out the attitude of college students toward sexual behavior before marriage and the know ledge and need on contraception.Methods An anonymous questionnaire survey was conduted among 1 126 college students selected with random cluster sampling.Results The students were tolerant to premarital sex.Among the students,82.76% considered non-marital sex being acceptable and 13.36% had premarital sexual experience.The average age at the first sexual behavior was 19.25 years for the students.For students having sexual behavior,16.67% of males reported their sex partners being pregnant and 6.06% of females reported pregnant experience.Only 58.78% of the students took contraceptive method when having sex every time,and only 21.85% of the students could selected correct method for emergency contraception.There were 89.78% of the students considered that it was necessary for the college to provide sex and contraceptive health education and wished to get the knowledge from lecture.Conclusion College students have a low level of knowledge and high level of need about contraception and have tolerant attitude to premarital sex.