The world economic system has been reorganized due to the end of the Cold War and the rise in regionalism since in the mid-1980s. In addition, Northeast Asian nations have been trying to create a new economic order based on economic interdependence. From this perspective, there is an urgent need for Northeast Asia nations to seek countermeasures. The linear free trade area theory for the creation of Northeast Asia economic zone entails multilateral cooperation, transforming ideological confrontation into multilateral cooperation, and non-symmetrical reliance between advanced and underdeveloped countries into inter-supplementary cooperation relations.