Introduction: Diabetes is a serious problem. Although physical activity is very useful for control of diabetes, motivating change in physical activity is very difficult. The aim of this study was to determine the effects of education, based on Health Promotion Model (HPM) in physical activity among diabetic women. Materials and Methods: In this clinical trial study, 80 women (40 patients in each groups) evaluated. All patients in the case group were educated for 1 session of group education, and 3 sessions of individual counseling with the 5 A’s method, based on HPM. Then patients in both groups, in the first, 3 and 6 months after education, were evaluated for changes and physical activity. Statistical tests included Repeated Measurement ANOVA, Mann-Whitney and Friedman with SPSS, version 16 were used for data analysis. Results: The results of repeated measurement ANOVA showed that the effects of time-group interaction effects education were significant for physical activity in the case group, the difference between case and control groups in physical activity being significant. Three and six months after education, the case and control groups had progressive stages of change. Conclusion: Intervention with the Health Promotion Model increased physical activity and improved stages of change for physical activity behavior in diabetic women.