This study is based on the recognition that the Rhee Syngman administration’s national assembly election system is the foundation of the korean national assembly election system. This study examined the Rhee Syngman administration’s national assembly election system as the process of creation, continuation, adjustment, and change through historical institutionalism. First, the creation process lacked awareness of political parties due to the absence of political forces that could directly affect the national assembly election act, resulting in more independent elections than political parties. Second, the continuation process had minor changes in the national assembly election act, but it did not have any effect on the election results. Third, the adjustment process established an absolute advantage of the liberal party with the founding of a political party and the introduction of party recommendation system by President Rhee Syngman rather than a change in the national assembly election act. Fourth, the change process not only the number of independent candidates decreased sharply due to the shorter registration period of candidates and the introduction of the deposit system, but the elected were mostly affiliated with political parties, and a two-party system was established to check the ruling party. The Rhee Syngman administration’s national assembly election system has a positive effect that it laid the foundation for the korean national assembly election system, it also had a negative effect of distorting the national assembly election system for stabilizing and extending the political power.