近十年來，中共海軍力量的發展如同其經濟成長情形一樣快速起飛，很自然成為西方矚目焦點，特別是建立遠洋艦隊的企圖，更引起外界高度關注。依中共海軍規劃，希望在2050年具備並達到遂行遠洋作戰的能力和目標。 冷戰結束後，中共被視為崛起的新興區域強權。「中國威脅論」也一度甚囂塵上。雖然中共極力反駁，但是一個經濟高度發展、致力於富國強兵的中共，不可避免的為亞太地區的安全帶來極大的陰影。中共對於亞太地區的影響力，除了經濟因素外，終究還是以軍事力量最為明顯，使得對中共軍事力量備感壓力的亞太各國，對中共以國防現代化來突顯國力，更加的敏感。在經濟建設成果日盛的情況下，中共為擴大其沿海地區經濟的發展，及符合大國身份所推動國防現代化，都將影響亞太地區的安全。 隨著綜合國力的提升，中共以更具實力與自信處理有關核心利益的爭端。面對中共政治、經濟、軍事的全面崛起，身為全球霸權的美國謀求確保東亞區域秩序的穩定。但儘管美國在2009年7月宣布重返亞洲，中共和鄰國在領土主權問題上依舊衝突不斷。 中共之擴張已使東亞國家充滿不安全感，亞太國家仍陷入一場軍備競賽之中，並進一步鼓勵同盟體之出現及刺激日本加強軍備以求自保。不管亞太地區是進入軍備競賽之權力平衡體系，或是其他國家聯合對抗中共之態勢，對亞太地區建構中之多邊安全體系都是一種打擊。 / In the past decade, the development of PRC’s navy power has grown as fast as its economical trowth. Naturally, such rapid growth attracts the attention of western countries. PRC’s attempt to build a far sea fleet is especially highly concerned by international community. According to PRC’s own plan, it hopes to achieve the previous goals in 2050. After cold war, China has been determined a newly-rising-power country, and has started trying to conquer all the power left in the Asia Pacific area after the seperation of USSR, and along with their motivation, the rumar of the “China Threaten Theory” has once spreaded out in the world. Thought China has rejected this kind of rumar, but it is still a well-known economic and army developed country and unavoidably, affects the Pan Asia area. Generaly, economics of China is the influence to the Pan Asia area, but actually, the quick army-building is the main effect; as a matter of fact, this influence (modernized China military) has become a big pressure to Pan Asia countries. In order to follow the quick progression of economics in China, it is also trying to build the coastal area and modernize its national defense. This motivation will badly affect the safty of Pan Asia countries. As China’s comprehensive national power rises with its rapid economic growth, it becomes more capable of protecting its core interests. As a global hegemon, the U.S. strives to wecure regional stability in East Asia. Although the U.S. proposed “the U.S. Retrun to Asia” strategy in July 2009, confrontation in the South China Sea between China and other claimants still continues. This thesis discusses the impact of the U.S. return to Asia on China’s South China Sea policy. East Asia counties are new feel not safe at all due to China’s military development,and the Pan Asia countries are still playing in a game of purchasing military equipments, and moreover, China even tell Janpan to purchase more gears for their own good. It doesn’t matter what kind of system that Pan Asia countries are in , either the military competition, or united with other countries to fight China, it all will become an impact to the vivid safty system that Pan Asia countries have built.