This research analyses the South Korean policy toward the north using two classical integration theories, functionalism and neofunctionalism. Although two theories were invented in the course of researching on European integration, it is not unnatural to apply them to the south-north Korean relation. After the start of dialogue with the North Koreans at the beginning of 1970s, the South Korean policy toward the north has been transformed several times in transformation can be explained by the circulation of functionalism and neofunctionalism. In most case, the approach begins with functionalism, then advances to the neofunctionalism. The circulation largely repeated twice during the period from early 1970s up to now. The major motives which transformed the approach from functionalism to neofunctionalism were the end of the cold war in 1989 and the South-Nothe Korean summit conference in 2000.