This study examined whether the participation of members in the decision-making process in a police organization affects the change of members' job satisfaction. And by analyzing the moderating effect of the class by dividing the class of police officers into managerial and practitioner levels in the relationship between the two variables, it aimed to further improve job satisfaction through participation in decision-making in the police organization. To conduct this study, a questionnaire survey was conducted on 304 incumbent police officers. Based on this data, relationship between decision participation and job satisfaction was analysed, and the moderating effect of class was also analyzed using multiple regression analysis methods. As a result of the study, the more police officers recognized the degree of participation in the decision-making process, the better their job satisfaction. Looking at the moderating effect of the class in this process, it was found that the more positively the middle manager perceived participation in decision-making, the greater the satisfaction level changed. Based on these research results, an alternative to improve job satisfaction by expanding participation in decision-making was suggested.