冷戰結束後，朝鮮半島依舊是東北亞區域勢力的交會點，區內相關國家始終沒有放棄在該區的利益。在2002年北韓核武危機嚴重影響東北亞的和平與穩定。中國從中協調舉辦了「三方會談」及六輪「六方會談」，與東北亞相關國家尋求和平解決對安全的憂慮，令北韓放棄核武計劃。在會談中，中國所扮演的關鍵角色令人關注。 本論文透過回顧中國在六方會談與北韓核武危機中扮演的角色，探討中國的戰略和分析其他參與國對中國的評估。隨著中國國力的相對崛起，中國在北韓核武危機與六方會談中發揮了至關重要的影響力。中國的東北亞政策採用現實主義的路線，維護北韓政權的存續，亦同時保障中國的安全利益﹔藉由主導六方會談去穩固區域現狀，以強化區域領導者角色，符合其最大的國家利益。 / After the Cold War, the conflicts on the Korean Peninsula still remain unsolvable over half century, the related countries have not given up its interests in the Northeast Asia region. In 2002, North Korea nuclear crisis has brought up the serious security concern to the Northeast Asia. China has organized "Trilateral Talks" and "Six-Party Talks", hoping to find a peaceful solution through mediation. China had played a key role in the Talks. This paper aims to explore and analyze the role and strategies of China in Six-Party Talks. China, as host of the Six-Party alks, played a vital role and had been engaged in more active diplomacy to defuse this crisis, leading its growing influence in the Northeast Asia. China has the potential both to guarantee North Korea's security, and to impose and enforce a denuclearization agreement. The role of China in the Six-Party Talk is to eliminate the North Korea nuclear capability, stable the status quo in the Korean Peninsula and strengthen its influence in the Northeast Asia region.

This paper examines different foreign policies of the Republic of Korea (South Korea) towards the Democratic People’s Republic of Korea (North Korea) with regards to a peaceful reunification of the Korean Peninsula. The paper uses the theoretical framework of Social Constructivism to analyze what impact the different foreign policies of South Korea towards North Korea have had on their relations, thus providing an understanding of what impact those foreign policies have had on the peaceful reunification process of the Korean Peninsula. The paper will also look at the First Korean Nuclear Crisis, the Second Korean Nuclear Crisis, the ROKS Cheonan sinking and the shelling of Yeonpyeong, and with the help from the theoretical framework of Social Constructivism, analyze what impact those incidents have had on South Korea’s foreign policy and relations with North Korea, thus providing an understanding what impact those incidents have had on the peaceful reunification process of the Korean Peninsula.

中、美關係一直以來都是國際的焦點問題且持續發展變化。自1972年中、美關係開始正常化以來，兩國的關係經常是在進展與停滯、合作與對抗中來回折衝，中、美之間在許多方面存在著矛盾，又在眾多領域裡有著共同利益。冷戰結束後，美國對中國的政策進行了大幅度的調整，新的矛盾與利益也逐漸凸顯出來。諸如人權問題、貿易不平衡問題和臺灣問題等等，皆是當前中、美鬥爭的焦點，但在安全、經濟貿易與科技文化教育和非傳統安全領域等方面又都有著共同的利益。在這種利益與矛盾交織的狀態下決定了雙邊以合作取代對抗的政策基調，也是中、美間在現今國際趨勢下必須的戰略選擇。 朝鮮半島位處陸權國家的心臟地帶與海權國家的邊緣地帶，對陸權國家而言，是連接海洋建立海權的重要跳板，對海權國家來說，則是向陸地擴張勢力的戰略捷徑，而此區域更是中國、俄羅斯、日本、南韓、北韓等權力競逐的主戰場，再加上美國在此經營布局已久，複雜的國際關係在此合縱連橫，時而欣欣向榮充滿希望，時又戰雲密布一觸即發。自朝鮮半島爆發第一、二次朝核危機後朝鮮半島的局勢更加詭譎多變，而朝核議題便如同一顆未爆彈時刻牽動中、美間最敏感的神經，金正日去世後，更增朝鮮半島的不確定性；在此嚴峻的挑戰下，中、美兩國的態度更是動輒得咎。 本文的主要目的於分析中美兩國自冷戰後迄今對朝鮮半島的政策比較，並針對外交、經貿、戰略佈署等方面作一全面探討，並以權力平衡角度分析在中、美共管亞洲的戰略結構下對南、北韓的影響，期能為未來欲從事相關研究的人提供參考。 / Relationship between the U.S. and China has always been one of the most focused issues internationally and it continues to develop and changes its shape as time goes by. Since 1972 both countries normalize their relationships, the U.S. and China had been going back and forth of deciding whether being collaboration or opposition, fits their benefits in a dynamic field. While the cold war ends, United States had made an adjustment by a wide margin on its policy to China, for instance, the Human Rights, Trade Imbalance, and Taiwan are the causes explain how China and the U.S. are constantly in conflict. However, correlates with Security, Economical trading, Technology, Culture, Education and Non-Traditional Land Security, the U.S. and China are aware of the importance of each other. All of the consequences, contradiction, and benefits led China and the U.S. to work together instead of being in battles which can be described “the strategic choices” 2 giants have made in the current international trend. The Korea peninsula locates in the heart of continental countries and at the edge of sea countries. For continentals, the peninsula can be the elevator of establishing its sea-power; and for the ocean authorities, owning the peninsula is one of the fastest strategic shortcut of expanding its power to the land. For decades, the area had been the battlefield for China, Russia, Japan, South Korea and North Korea, and adding the glimpse of the U.S, which makes the peninsula one of the most comprehensive international involvements in the world. Since the 1st and the 2nd North Korean nuclear crisis occurred, the discussion of nuclear weapons in North Korea tangles the sensitive nerves between the U.S and China. As Kim Chong Il dies and leaving all the questions left to rest of the world, the uncertainty of the peninsula had increased; under rigorous challenges in the international community, the attitudes of China and the U.S. can entirely influence the globe. The essay mainly focuses on the analysis of the comparative policies to the Korean Peninsula in between China and the U.S after the Cold War, as well as the probing into Diplomacy, Trade, Deployment for a entire scan, in order to understand the angel of power of balance to mutually manage Asia’s strategic structures and how it can be effective to North and South Korea. The article hopes can provide critical information for scholars in future to attempt related research on sphere in such matter.