Abstract: Objective To explore the moderating effect of perceived organizational support on work-family conflict and job performance among prison police officers for improving prison management and enhancing job performance of prison police officers.Methods Stratified cluster sampling method was used to investigate 1 400 prison police officers from three prisons in a province.Work-family Conflict Questionnaire,Perceived Organizational Support Questionnaire,and Job Performance Questionnaire were used.Results The average score of work-family conflict in the prison police officers was 27.98±7.05; the score was 22.86±6.92 for family-ork conflict,39.39±1.00 for perceived organizational support,and 74.11±12.82 for job performance,respectively.The contribution of work-family conflict and perceived organizational support to job performance was 23.7%; the contribution of moderation was 2.5%.Conclusion Work-family conflict and perceived organizational support are predictors in evaluating job performance among prison police officers and perceived organizational support has a moderating effect on the relationship between work-family conflict and job performance.