PURPOSE: The purpose of this study was to identify factors influencing exercise behaviors of the male manual workers and office workers based on health promotion model by examining the relationships among them, and then to provide basic information for developing exercise program. METHODS: The 97 laborers and 99 officiers were collected from two worksites. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficients and multiple regression. RESULTS: Male laborers' exercise behavior was significantly influenced by exercise self-efficacy, exercise social support and exercise experience over 3 months, and these factors explained 50.2% of the total variance. Male officiers' exercise behavior was significantly influenced by exercise self-efficacy, subjective health status, perceived exercise barriers and exercise social support, and they explained 47.3% of the total variance. CONCLUSIONS: Based on the findings that exercise self-efficacy and exercise social support commonly influence exercise behavior of male laborers and officiers, there is a need to develop an exercise program to improve exercise self-efficacy and exercise social support.