Motivation as a psychological factor can affect the mental health of employees and consequently the health of work place. It has been recently concerned in the social science literature. The present study aimed to assess the mediating effect of job satisfaction on the relation of motivation, perceived support and training to perceived commitment. The data study analyzed in the structural equation modeling method. The data were gathered in library field, and, also using questionnaire. The data were achieved from staff of Sabzevar city municipality using validity and reliability approved questionnaires. For validity, face and construct validity and for reliability, Cronbach's alpha was used. Finally, data from 159 questionnaires were analyzed. The findings showed that motivation, perceived support and training had positive significant effects on normative and continuance commitment of employees. Also, positive significant effect of job satisfaction on continuance and normative commitment was confirmed. In addition, the findings of this study indicated positive effect of motivation, perceived support and training on perceived commitment with mediating role of job satisfaction. In other words, the more motivation, perceived support and training are, the more job satisfaction will be, which in turn can result in the increased continuance and normative commitment.