Abstract: Objective To explore the relationship between perceived organizational support and job satisfaction and the mediating role of organizational commitment on the relationship.Methods Stratified cluster sampling method was used to investigate prison police officers from three prisons in Liaoning province.SPSS 17.0 and Amos7.0 statistical software were applied to perform statistical analyses and to test study hypothesis.Results Perceived organizational support was positively associated with job satisfaction(β=0.621,P < 0.001) and explained 38.1% of variance in job satisfaction.Organizational commitment was also positively associated with job satisfaction(β=0.287,P < 0.001) and explained 7.6% of variance in job satisfaction.The direct,indirect,and total effect of perceived organizational support on job satisfaction were 0.53,0.13,and 0.66,respectively.Conclusion Perceived organizational support and organizational commitment have important influence on prison police officers' job satisfaction.And the organizational commitment has a mediating effect on the relationship between perceived organizational support and job satisfaction.However,the direct effect of organization support on job satisfaction is greater than its indirect effect.