Abstract: ObjectiveTo explore relationships betwen effort-reward imbalance,work-family conflict,perceived organizational support and job performance among prison police officers,and to provide information for the improvement of job performance in prison police officers. MethodsTotally 1 048 prison police officers from three prisons in Liaoning province were selected with stratified cluster sampling and investigated by a questionnaire. ResultsThe average total score of job performance was 74.11±12.82,with the three dimential scores of 26.53±5.35 for job devotion,23.50±4.34 for task performance,and 24.08±4.29 for interprsonal relationship promotion.The results of hierarchical regression revealed that the main influencing factors of job performance were reward (β=0.224),overload work (β=0.084),work-famil conflict (β=0.293),family-work conflict (β=-0.307),perceived organizational support (β=-0.171),and family-work conflict×perceived organizational support (β=0.119),respectively. ConclusionEffort-reward imbalance,work-family conflict and perceived organizational support are predictors of job performance among prison police officers..