The purpose of this study is to draw policy support needed to strengthen the capacity of the free semester system of unit schools in Korea by systematically diagnosing the ability of teachers and schools in operating their free semester system programs. To this end, 216 middle school teachers in Chungbuk area were surveyed to measure the level of perceived importance and actual retention of such competences to operate the free semester system, and the requirements and priorities of middle school teachers were reviewed using ‘Borich s demand analysis’ and ‘the Locus for Focus model’. According to the analysis results, the ability to matching needs and resources and connecting and coordinating between subject classes and free semester activities were relatively low in the capacity to operate the school curriculum management, and the ability to share roles and allocate tasks, operation of professional learning communities, and participation and cooperation of parents was low in the school organization management area. Meanwhile, as a result of analyzing the requirements for support considering the importance of each competency element, support for designing programs for free semester activities , linkage and coordination between subject classes and free semester activities , recording and management of students performance and communication and feedback on evaluation results were urgently needed to improve the capacity of school organization. In addition, support for allocation of roles and task , database construction , and strengthening of professional learning community was selected as priority. Based on such results, policy measures were discussed to strengthen the ability of unit schools to operate the free semester system according to priority.