馬英九當選台灣總統及其新政府的執政，可能衝擊美國的兩岸政策與區域政治的權力平衡。這主要是兩岸關係的變動以及帶動東亞間權力結構的均衡與維持。美國的兩岸政策或對台的政策與承諾，總是美國全球戰略的一環並維持數十年來的穩定性。馬英九新政府對美國政府的對華政策反應，應該是一個良好的觀察點。然而，本文研究主要側重於對台部份，並從傳統上美國的對台政策與內涵作為論述基礎，且參酌歐巴馬新政府的對台政策意向，來探討美國的兩岸政策是否改變，或美國對台的最新政策及其未來的意義與走向為何。本文是從美國兩岸政策的基礎元素、新政策元素、模糊戰略這三者作綜合性的觀察，來認定美國的政策意涵與走向。 The Ma Ying-jeou and his new government may impact U.S. Cross-Strait policy and the balance of regional political power. Mainly, that was resulted from the changing of Cross-Strait relation and the political structural balance and maintenance of East-Asian region. The U.S. Cross-Strait policy and commitment toward Taiwan, always is a section of U.S. global strategy that keep the stability for decades also. Ma Ying-Jeou and his new government may stir the reaction of U.S. in its Cross-Strait policy, that will be a good point for observing. However, this article mainly stress the part of Taiwan from its policy and is shaped the discoursing base from U.S. classical policy toward Taiwan. Additionally, to refer the opinions and trend of Obama new administration to research the U.S. Cross-Strait policy whether change or not. As well as, to study the most new policy of U.S. toward Taiwan and the significance or trend in the future. This article go from the "basic element of U.S. Cross-Strait policy," the "new element of policy," and "ambiguity strategy" such three items to be the observing index to assess U.S. policy will be.