Objective To understand the status of sexual education about single-parent family adolescents in Jilin city. Method A survey of 300 single-parents family adolescents and 300 double-parents family adolescents was conducted in six schools of Jilin city. Results Most of subjects had a few understand about sexual knowledge of puberty,but quite a few subjects had a little knowledge about human physiology,particularly in single-parent family adolescents.Compared with two-parent family teenagers,single-parent family adolescents received few knowledge from their parents.the single-parent's adolescents were easier to accept puppy love,sex education and sexual behavior before married than the two-parent families.The difference between them was statistically significant(P<0.01). Conclusion It is very important to understand current sexual knowledge,attitudes and behavior among adolescents so that we can design effective intervention program.Adolescent sexual education should be get attention of the whole society,especially single-parent adolescents.