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In Macau, gaming is a pillar industry. The job performance of the employees is a determining factor for gaming and integrated resorts’ ability to improve their competitiveness in an evolving environment. Therefore, organizational behavior is an important topic for gaming and integrated resorts. In view of social exchange theory, this study takes the employees of the six gaming and integrated resorts in Macau as sampling. The study would be overviewing how psychological contract fulfillment affects their organizational citizenship behavior in the organization, and relationship between work engagement and their abusive supervision in the six gaming and integrated resorts employees in the Macau gaming and related industry. This study takes psychological contract fulfillment as the independent variable, organizational citizenship behavior as the dependent variable, work engagement as the mediating variable, abusive supervision as the moderating variable. Data was collected through random online questionnaire research method and 257 valid questionnaires were obtained. SPSS statistical software applied for reliability and validity analysis, Pearson correlation and regression analysis. The conclusions are listed in following: (1) Psychological contract fulfillment has a partial positive impact on organizational citizenship behavior ; (2) Psychological contract fulfillment has a partial positive impact on work engagement; (3) Work engagement has a positive impact on organizational citizenship behavior; (4) Work engagement has a positive mediating effect between psychological contract fulfillment and organizational citizenship behavior; (5) Abusive supervision has no moderating effect between psychological contract fulfillment and work engagement; (6) Abusive supervision has no moderating effect between work engagement and organizational citizenship behavior