Public security, traffic management and service for the people are the three major functions of policing. To assure the quality of police service, which is contingent on the people who render the service, has become the core of policing. This study aims to investigate the relationships between work values, organizational trust, and service-oriented organizational citizenship behaviors (OCBs) with the Taiwan police college students as research samples. We used SPSS and LISREL to analyze and test the relationships. It was found that perceived work values and organizational trust had positive effects on the service-oriented OCBs. It was also found that work values had a positive effect on the service-oriented OCBs through the mediation of organizational trust. Suggestions and recommendations for future research were accordingly discussed.