The prospects for the theory and practice of regionalism in the wake of financial crises provided a key rationale for comparative regionalism. Two particular issues spring to mind: the relationship between ”area studies” and studies of regionalism and the more specific question of ”EU studies” in the analysis of the regional processes. Asia region realizes the importance of the financial cooperation of currency inside the district in East Asia after 1997 financial crisis, the Asian Development Bank again puts forward the concept of ”the monetary unit in Asia” (the Asia Currency Unit, ACU) in 2006. After Euro promotes successfully, the Asia Development Bank also expects East Asia region can develop the monetary unit, enhances the development of the regionalism, increases the benefit of the regional integration, so the process the European currency unit policy is the basis of reference. Under the context, I also want to explore the process of international socialization by the index: common interest and state learning. By researching the Europe and Asia monetary policy, I hope to construct the structure of the comparative regional research, and also hope to figure out the solution during the development process of monetary policy in Asia.