This study examined the factors affecting police officers' proactive behavior in changing police organizations by dividing them into personal and organizational characteristics, and empirically verified the effect of public service motivation in their relationship. To conduct this research, a survey was conducted targeting police officers, and a total of 168 copies were used in the final analysis of this study. The results of the analysis are as follows. First, it was confirmed that public service motivation was influenced in the following order: collective tendencies, individual tendencies, job satisfaction, and organizational commitment. Second, it was confirmed that group tendencies, job satisfaction, individual tendencies, and organizational commitment had an influence in that order in leading behavior. Third, it was confirmed that public service motivation had a mediating effect on the relationship between individual characteristics and organizational characteristics in the proactive behavior of police officers. That is, it was found that not only the personal characteristics of police officers, but also the organizational characteristics and public service motivation play a major role as factors influencing proactive behavior in changing police organizations.