The results of cross-sectional descriptive study using qualitative and quantitative method about knowledge, attitude and behavior on reproductive health of 10th grade students in two high schools in Nam Dinh province showed that: 1) There were 8 percent of female students and 11 percent of male students not to know the sign of puberty of their gender
17 percent of students to know correctly about the time to be easy to get pregnant in menstrual cycle
13 percent of students not to know any contraceptive method. 2) If having pregnancy, 17 percent of students did not know at least a cause of unwanted pregnancy and 19 percent of students did not know any complication of abortion. 3) To except for HIV/AIDS, students knew the name of sexual transmitted diseases less
and 13 percent of students did not know how to prevent these diseases. 4) There were 40 percent of students with pathological findings in the genital. When having these findings, students always chose to tell their parents (59 percent)
to go to the consulting room (21 percent)
to do nothing (18 percent)
not to tell anybody (8 percent) and to get medicines by themselves (5 percent). 5) Sources of information on reproductive health were mainly through radio and television (70 percent), books and magazines (62 percent), the Internet (60 percent)
but other sources such as teachers, friends, parents, health care facilities, siblings and relatives had the ratio lower than 50 percent. Recommendations for school were to supplement gap on reproductive health knowledge in high scholl and to develop communication. mechanism between school and family to complete the knowledge, attitude and behavior on reproductive health for high school students.