Background & Objectives: The breakfast as the most important meal is ignored more than other meals by children and adolescents. This study was aimed to investigate the effect of education based on knowledge, perception and performance about having Breakfast on primary school student boys. Methods: This quasi-experimental study (controlled type) was conducted in 2013 on 200 primary school student boys in Qom city into both case (n=100) and control(n=100) groups. Random sampling was used. Data were collected using researcher-made questionnaire based on HBM constructs, which its validity and reliability was confirmed. Educational intervention included of three 45-minute sessions of the group discussion, lecture, question and answer, role play and pamphlets delivery. Collected data were analyzed by SPSS software. Results: Before the intervention, there wasn’t significant differences in terms of knowledge and perceived susceptibility, severity, benefits, barriers, and performance in both case and control groups. While these factors were significantly higher in the intervention group compared to the control group and perceived barriers have fallen after the intervention (p<0.05). Conclusion: Designing HBM-based educational programs can be effective on students' eating behaviors. Regarding the important role of students as the future generation and also low cost of health education compared to other activities in this area, such programs need to be extend and expand.