The United States and Vietnam broke the deadlock after-Vietnam-War in 1995, and both of them make far progress on the fields of economy and strategic safety. Vietnam has performed well on economic development since the Doi Moi in 1991. In 2001, USA and Vietnam signed the trade agreement and developed faster. The relationship between USA and Vietnam gradually recovered in the past ten years, and which played an important role of Asia circumstance and region safety. In the process of normalization of the relationship between two countries, there are several China¡¦s factors such political, economic, and strategic benefits for both sides. Therefore, when researching USA strategy for South East Asia, Vietnam plays an important role. This research is based on geopolitics to study the process and factors of USA and Vietnam relationship. Then it could see that their relationship will develop faster and closer.