中文摘要：

在海湾战争前，伊拉克是美国的盟国。这话听起来简直不可思议，但这却是事实。美伊关系嬗变特征主要表现在以下四点：历史上的盟国关系、两伊战争期间的密友关系、海湾战争前的挑衅与纵容关系、海湾战争后的敌对关系。美国在伊拉克战争中消灭了自己曾经的盟友，这也符合美国一向奉行的外交政策标准：“没有永恒的朋友，没有永恒的敌人，只有永恒的利益”。美国和伊拉克从盟友到仇敌关系的嬗变特征可以看出美国选择盟友的原则是利益需求，而不是道义和价值取向。

英文摘要：

It sounds inconceivable that Iraq was American ally before the Gulf War, but it is the fact. The main changing characteristics of relations between America and Iraq are as follows ： relationship of allied country in history, of close friendship in The Iran - Iraq War, of aggression and connivance before The Gulf War, and of hostility after The Gulf War. In the war of Iraq, U.S. has annihilated his ever ally that it accorded with American foreign policy standard： there is no forever friends, no forever enemies, but forever interests. Changing characteristics of relations between America and Iraq from ally to enemy shows that the principle of America choosing ally is behalf requirement, neither morality orientation nor value orientation.