Treaty of Rome, which was created among the 6 EEC countries has a distinctive significance in history of EU. Charters, Articles, and protocols in this treaty provide the legal basis for the free movement of goods and services, the creation of Customs Union, the abolition of Quantitative Restriction, the cooperative policy in broad aspects, the creation of European Investment Bank, and the institutional devices which enable all. These innovative contents naturally had a crucial impact to other European treaties. Considering that Treaty of Rome was created in 1950, near to the demise of World War Ⅱ, it is plausible that it gives a remarkable impact to the development of the modern international law. Structures and language of Articles has been continuously repeated in many regional agreements. In terms of the fact that regional agreements operate as a structural model in international society, Treaty of Rome still has an implication to current circumstance. Therefore, Treaty of Rome could give a lesson to the East Asia. Regional integration in East Asia is not enhanced enough to EU, at least they agree on its necessity. Again, considering that contribution of Treaty of Rome to EU and regional agreement in the international society is large, it could provide the touchstone in regional integration of the East Asia. With an endeavor of regional agreement in East Asia, Treaty of Rome could lead to a more sophisticated approach.