The purpose of this study were to investigate relations among the variables of teachers' work load, job satisfaction, organizational commitment, teachers' professionalism and schools' educational outcomes, and to examine the meditating effects of teachers' job satisfaction, organizational commitment and teachers' professionalism in the process by which teachers' work load affected schools' educational outcomes. Subjects of the study were 251 high school teachers in the Seoul metropolitan area and Chungbuk province. AMOS 7.0 was employed to analyze the data. The results were as follows: First, teachers' work load had a direct impact on teachers' job satisfaction. Second, teachers' job satisfaction affected teachers' affective commitment among three organizational commitments. Third, teachers' affective commitment directly affected teachers' professionalism. Fourth, teachers' professionalism affected positively schools' educational outcomes. Fifth, it was found teachers' job satisfaction, organizational commitment and teachers' professionalism were all meditating factors in the relationship between teachers' work load and schools' educational outcomes. In other words, if teachers' work load was reduced, the schools' educational outcomes (as perceived by teachers) would improved; once teachers' work load was decreased, teachers' job satisfaction would increase naturally, teachers would make an affective commitment to the organization, make efforts for their professionalism, and finally, schools' educational outcomes would naturally be achieved.