While economic integration has been progressing institutionally by governmental agreements both in EU and in NAFTA, economic integration in east Asian countries has been going on unofficially in trade, foreign direct investment and currency. The preconditions for institutional integration among east Asian countries seem to be satisfied to a certain degree. Furthermore as international financial system based on dollar is challenged by euro and the role of lMF shows limit in dealing with currency crisis, it has become necessary for east Asian countries to formulate an economic cooperation institutionally. The following are the implications of the progress in regional integration among east Asian countries with respect to Korean economy. First, proper adjustment of industrial structure should be made in Korea. Secondly, possibile types of regionalism should be considered while respecting global free trade agreement. Lastly, measures of monetary cooperation among east Asian countries should be persistently sought for to achieve the stability in monetary and foreign exchange market. JEL Classification: F020, Fl50, F330, F420