Background: This study examined whether an application of pedometer to community health promotion program may affect on body composition, physical activity level and activity behaviors of middle aged overweight women. Methods: Participants were divided into two groups of exercise program with pedometer (PEx, n=24) and without pedometer (Ex, n=25). Before and after a 12-week program, their body weight, body composition, waist-to-hip ratio (WHR), and body mass index (BMI) were assessed, and physical activity level using International Physical Activity Questionnaire (IPAQ) as well as activity behaviors were evaluated. Comparisons between groups were made using one-way ANOVA with repeated measures. Results: The body weight, body fat contents, WHR, and BMI decreased significantly and lean body mass increased significantly in both groups after 12 weeks (p<.05), but not significantly different between groups. Physical activity level was increased in both groups after the program (p<.05) but not different between groups. The caloric intake decreased, the meal regularity improved, and physical activity behavior increased after the program (p<.05), but no difference was found between groups. Perception on current health status had improved in PEx (p<.05). Collectively, an application of pedometer to community health promotion program did not show additional improvement of physical activity level over non-application of pedometer. Results: Although various explanation over the results could be possible, it may be due to the pedometer as a mechanical tool that are not friendly to this particular population. It could be suggested that elevated motivation toward exercise participation may not be expected while only providing mechanical tools. Instead, an application of mechanical tools as well as continuous monitoring with feedback system may be necessary.