Background: Regarding the importance of the youth in terms of the spread and risk of catching AIDS and since the only tool to control the disease is education, the present study was carried out to investigate the effects of Health education on knowledge attitudes and Behavior of students of high school in Zahedan.

  Methods: This pre-post quasi-experimental study was done on 280 high school male students in zahedan.Data were collected with a questionnaire before educational intervention, and one month later. The obtained data were analyzed by SPSS software at the significant level of α=0.05.

  Results: The students' mean knowledge score increased from 11.80±3.008 to 16.32±1.97(P<0.007), their mean attitude score from 22.17±3.02± 27.57±3.23(P<0.002), and their mean behavior score from4±1.14 to 5.63±1.33 (P<0.006) after education.

  Before intervention,27% of the students had weak knowledge, 40% had average knowledge, and 23% of them had good knowledge, but after intervention these percentages changed to 5.4% (weak), 20.6% (average), and 74% (good) respectively. Before intervention 20.2% of the students had weak attitude, 51.8% average attitude, and only 28% enjoyed good attitude. These percentages changed to 0.7%, 7.9%, and 91.4% after the intervention Before intervention 38.1% of the students had weak Behavior, 51.8% average Behavior, and only 10.1% had good Behavior. These percentages changed to 0.7%,15.7%, and 83.6% after the intention.

  Conclusion: Since the effect of education on the promotion of students’ knowledge and attitude, behavior has been approved, implementing health education programs in schools must be taken into consideration as aneducational priority on the part of health and education authorities throughout the country.