This study analyzed the process of policy formation of Free Semester Program and policy change of Free School-Year Program based on Kingdon ’s policy streams model. As a result of the analysis, it was found that the politics stream of the presidential election strongly influence the policy window to open. The stream of the politics of ‘presidential election' and the stream of policy alternative of ‘Free Semester Program’ proposed by the campaign promise of the presidential candidate, combined with the problem stream of primary and secondary education in Korea, that is competition-oriented and mismatched with workforce demand. With the beginning of Park Geun-hye administration, the Free Semester Program was adopted as one of the major national agenda. The streams of policy alternatives flowed such as innovative schools, career-oriented school year programs. By adopting policies, concrete policy alternatives have been formed. In the aftermath of the free semester in the school field, there were positive feedbacks on the free school and the negative feedbacks on length of one semester was not enough for implementing the free semester. It brought the policy changefrom ‘Free Semester Program' to ‘Free School-year Program'.