In Korea, separation of power is called separation of the three powers of legislation, justice and administration. This guarantees the basic rights of the people. And it is a basic constitutional principle that divides state power into legislation, administration and justice to prevent abuse of power and to balance it with each other.<BR> Generally, when discussing the separation of power in Korea, Locke’s theory of separation of power and Monteski’s theory of separation of power are basically introduced. In terms of institutions, the United States is the country that best institutionalized the principle of separation of power. In general, the relaxed form of separation of powers can be called the U.S. presidential system, the British parliamentary cabinet system, and the French dual-governance system.<BR> Under the Korean Constitution, the National Assembly is the only legislative body, and the executive powers are the administration, the president, and the judicial powers are the Supreme Court and the lower courts and the Constitutional Court. Article 40 of the Korean Constitution stipulates that legislative power belongs to the National Assembly. This is that the National Assembly is an institution that directly represents the people who are sovereigns, and that exercises legislative power, which is the most basic of the national action. And on the political front, the separation of power is the central value of state affairs. The court is curbing the power of two other powerful agencies by allowing the Constitutional Court to exercise its right to review unconstitutional law orders and all other state actions. In other words, our country is led by the presidential system. And it has a unique form of content that adopts the form of American judicial power. Formally, checks and balances work fairly among the three powers. How does France grasp and realize the separation of powers? And what is it if there is a constitutional basic ideology that can sum up or supplement the separation of powers? The purpose of this paper is to review the answers.<BR> Korea seems to be embodying an ideal separation of powers in terms of formality. In reality, however, voices of public opinion and minority claims are difficult to convey to the center of politics. If this is not improved even though we are well aware of it, there will be no politics based on the ideology of a constitution. At this point, I would like to review the form of power separation centered around France.<BR> When the French Constitution states that the final purpose of the Constitutional Court is to prevent absolute power from being overthrown against tyranny, can the guarantee of rights and separation of powers be practically separate? After all, in order to assess the principle of separation of powers, one must think in relation to the idea of a law-governed state. France"s separation of power suggests two grounds. The former is linked to the idea that separation of power is the autonomy of power. And the latter derives the importance of guaranteeing rights in the Constitutional Court in the separation of powers.<BR> Therefore, the proper form of the Constitutional Court could be a problem. As such, France also points out that the June 3, 1958 law, which recognized the basis of the Fifth Republic Constitution, refers to the separation of powers, and that the Constitutional Court clearly favors the constitutional principle of separation of powers in its ruling.