Because in the 1970s, when the United States faced the direct threat from the former Soviet Union, it urgently needed China's cooperation. After the Cold War, China's cooperation is also needed in dealing with the Korean Peninsula crisis, maintaining stability in the Asia-Pacific region, and preventing the proliferation of large-scale weapons. This all belongs to the category of strategic interests. The second aspect is economic benefits. China's sustained economic growth and huge market potential in the 1990s are self-evident to the United States. Since the establishment of diplomatic relations between China and the United States, the actual economic benefits obtained by the United States from the development of bilateral relations and the expectation of occupying a larger market share in China have become the internal positive motive force of the United States' China policy and have always been an important factor for the United States to support the development of relations with China. The third aspect is to promote the interests of American values centered on "human rights". Transforming the world with American ideology has always been the ultimate goal pursued by American foreign policy, but taking it as a realistic national interest and a specific goal of foreign policy is closely related to the change of American strategic position after the Cold War. An important American strategist once wrote a special article to analyze this, arguing that with the enhancement of the role of soft power in the information age and the superior position of soft power possessed by the United States, the value concept centered on promoting "human rights" should be defined as the national interest in the current priority position and effectively integrated into American foreign policy. In fact, it has become an important aspect of the adjustment of American policy toward China after the Cold War. Starting from the overall national interests of striving for world leadership, how to deal with China's potential challenges is the central issue of American policy toward China after the Cold War. In this sense, the change of the world pattern is the fundamental factor that affects the evolution of American policy toward China. During the period of hegemony between the United States and the Soviet Union, China was an important factor restricting Soviet hegemony. After the end of the Cold War, China was in an active position in opposition to American hegemony, which was a new substantive change in Sino-US relations brought about by the changes in the world structure after the Cold War.