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.