近年來中國崛起的速度愈來愈快，尤其經濟上的成長更為明顯。美國意識到中國崛起後，害怕在東亞的利益會遭受中國的威脅，因此美國國務卿柯林頓在2010年7月表示美國將重返亞洲，而未來十年美國會把經濟、外交的重點放在亞洲地區。面臨全球化的時代，美國和中國處於既競爭亦合作的關係，美國和中國的發展互動也將影響到兩岸關係的發展。兩岸關係的發展從軍事衝突階段，和平對峙階段，民間交流階段一路演變下來，雖然說兩岸關係的發展愈來愈和平，但中國大陸在國際上時常以打壓的方式，而使台灣備感壓力。本研究試從美中競合來分析。美國重返亞太後，與中國的競爭及合作的關係下，對兩岸關係發展會有怎樣的變化，兩岸關係會掉入困境或有新的契機出現。本研究將採用文獻分析研究法，結合?岸與國際現勢，透過新現實主義理論來探討美國在亞太戰略布局，及中國如何回應，並從中探究對台海問題有甚麼樣的影響，並對台灣未來在兩岸關係發展做出建議。 The speed of China's rise has become faster and faster in recent years, especially economic growth. United Stated realizes that China's rise, and they afraid the benefit of East Asia threaten by China. Therefore, in the July, 2010, United States Secretary of State, Clinton’s mentioned that United Stated would pivot to Asia. In addition, they will focus on economic and diplomatic interests in the Asian region. In the generation of globalization, United Stated and China would stay not only competitive but also cooperative relationship. The interaction of United States and China will influence development of cross-strait relationship.The development of cross-Strait relationship begin from military affairs to peace confrontation, and people-to-people contact. Although the developing cross-strait relationship getting more and more peaceful, Taiwan still feel stressful because China keep bashing on Taiwan in the International Communities. The research is used to analyze US-China Relations. What will happen to the development of cross-strait relations in the US-China Relations after United States pivot to Asia. Cross-Strait relationship will get into trouble or have new opportunity. The research will adopt documentary analysis, to combine Cross-Strait and international relations to discuss the strategy in Asia-Pacific of United States through Neo-Realism. According to the response of China to discuss Taiwan Strait problem, and to make recommendations to Taiwan the development of Cross-Strait relationship in the future.