<p><strong>OBJECTIVES:</strong> Students attend sedentary life style and less like vigorous physical activity. This study investigated the effects of School-based intervention<strong> </strong>on increasing physical activity for decreasing obesity among high-school obese and overweight boys, based on the components of PRECEDE PROCEED Model, to participate in median - vigorous physical activity among the first Period of high school boys in the city of Urmia, Iran</p><p><strong>METHODS:</strong> This study was an experimental intervention that conducted at 4 high schools that were divided into 2 groups of intervention (40) and the control (40) male students, schools in junior high schools in Urmia.</p><p><strong>RESULTS:</strong> Three and six months after the intervention, significant differences were found between the experimental and control groups of schools, in the amount of students’ participation in vigorous physical activity (p<0.01).</p><p><strong>CONCLUSIONS:</strong> According to the results, the school-based intervention and components of PRECEDE PROCEED Model had a positive impact on the improvement of physical activity and decrease in physical inactivity among the students.</p>