The current situation in the region has been affected by several factors such as China s military modernization, the North Korean nuclear issue, Japan s collective self-defense as the expansion moves. Because of the uncertainty of the situation in the region it has been increasing more than ever. In addition, the Northeast Asian international order is being deployed in a multi-layered structure in much more complex, than in other regions . Among these , while switching the focus of the Obama administration s foreign policy in the Asia- Pacific region, the United States and around the middle interaction between regional orderly reorganization process is underway in China and has been an important axis of regional order in the conversion process. This study analyzes the political, economic and security that the US-China relationship, which exposed the dual nature of cooperation and competition in the context of such a complexity, form a multi-layer power relationships in ortheast Asia and how are linked. In particular the military and security strategy of the Obama administration and the US regional hegemony, China Xi Jinping Leadership from potential competition dimension aims to analyze whether the project is in some way to the local course. First To do this, the 21st century will trace the historical context of the US-China relationship is being developed as a new aspect. Second, with respect to the actual analysis of the underlying and the recognition of mutual recognition of the two countries. Third, deploy them, and explores the policy based on the projection and policy orientation of the two countries. Finally analysis and prospect about the structural composition of US-China forces, as it implied the possibility of transient transformation.