The Bush administration was at the transition period of the world order: from cold war toward post-cold war era. During this period, many significant international events happened, which caused the structural change of international polictis. The purpose of this thesis is aimed at analysising the foreign policy desision making from 1989 to 1992. Through the building of decision making model, the author try to argure that the policy making pattern and process in this period has its features, and these factors influence the shape of American foreign policy.In this thesis, the author builded up the decision making model of Bush era. In order to test the model, the author put 8 cases to test the model. These cases are: the reunification of Germany; Beyond Containment; Tainanman Square case; the invasion of Panama; Gulf crisis; New World Order; the collapse of USSR; and Yogoslavia case.At the end, the author conclude that the foreign policy decision making is highly concentric, and personal factors influence much on the foreign policy decision making. The rule " Presidential dominant" still exist. Due to President Bush's foreign policy experience, the decision making was mainly made in the white house.