: In this study, the priority was assessed and the compensation relationships were analyzed with regard to the issue of port development with conflicts among decision-makers. First, the assessment factors were selected by the relevant literatures on port development, and fuzzy structure modeling was used to select assessment factors via structuralization analysis. Second, the local residents, port users, and local government were chosen as the main port-development-related entities, and the analytic hierarchy process was used to calculate the total assessment value. Third, the justice-based-on-majority-power-rule method was used as an assessment method that would minimize the amount of complaints according to the total assessment results and the alternative selection when a partnership was formed among the assessment entities. Moreover, the compensation issue according to the alternative selection was quantified, and the compensation relationships were analyzed. As a result, it was found that port development in Busan must be the top priority in terms of port development in South Korea, that awareness of environmental issues must be promoted among the port users, and that the local governments must promote environmental-incentive policies for Environment-friendly port development.