中東地處歐亞非交界，是地緣戰略不可忽略的地方，亦是全球的能源生產重地，世界強權皆欲在此佔有一席之地，其中伊拉克含括兩河流域，為中東地區中心位置，石油儲量全球第二，戰略地點更顯重要，但宗教派系紛爭及強權覬覦的影響，伊拉克經常呈現紛亂狀態。 911事件後，美國將伊拉克列為邪惡軸心國家之一，認定其與恐怖組織掛勾，危害國際社會，決定再次出兵撻伐，並計劃以「美式民主」將伊拉克改造成中東的民主表率，期能在該地區推動民主風潮，但事實與結果卻是美國深陷伊拉克戰爭泥沼，為此付出極大代價，並被國際社會批判。 美國對伊拉克發動戰爭共經歷小布希總統及歐巴馬總統共3個任期，兩人政黨背景不同，執政理念存在差異，執政期間亦經歷各種國內外不同事件之影響，繼而產生不同的伊拉克政策；分析比較兩位總統在對伊拉克戰爭期間的做法，有助探討美國在不同政黨及總統外交政策的延續情況。 經過探討小布希總統與歐巴馬總統採取的伊拉克政策、對極端分子的態度及國內外重大事件等對美國伊拉克政策的影響，顯示美國不會因政黨及總統改變而轉變其外交政策，其政策是延續性的，政策的最高原則仍是將國家利益與安全放在第一位。 / The Middle East which is located at the junction of the three continents of Europe, Asia and Africa, is important for both geography and energy. That is the reason why all powerful countries wanted to occupy it. Iraq which includes Mesopotamia is in the central location of Middle East and takes the second leading in the world’s oil output. However, Iraq is usually in a unstable situation because of religious tribal disputes and keen competition of many powerful countries. After the 911attacks, the United States identified Iraq as the key of the evil countries and also a terrorist organization. The U.S. sent troops to attack Iraq and planned to transform Iraq into a democratic example of the Middle East with "American democracy". However, the U.S. paid a great price, and faced lots of criticism from the international community. The United States launched a war against Iraq across the term of office from President George W. Bush to President Barack Obama. Because the two presidents of different political parties and leading styles were influenced with various internal and external events, they also held different policies to Iraq. To analyze and compare the measures took by these two presidents in the Iraq war will help us to explore the situation of the U. S. foreign policies during the two political parties. After analyzing the foreign policies of President George W. Bush and President Obama towards Iraq and terrorist, we can know that the U.S. did not change its foreign policy through the two presidents of different political parties. The policy practiced by U.S. is continuous and consistent. The U.S. always put the nation’s interests and safety in the first place.