From President Hu Jintao's visit to the United States in January 2011, at which time two countries reach the compromise of constructing the cooperative partnership with mutual respect and mutual benefit, to Vice president Xi Jinping's visit to the United States in February 2012, at which time we advocate the new model of relationship of great powers that "have no predecessors, but open a new door for the arrivals" between China and the United States, the main theme of Sino-US relation is that summarize the basic experience and regularity, and assess objectively the emergence of problems and changes between China and the United States in recent years, then picture out the new framework and route-map of the future of Sino-U.S. relations. In this paper, we analyze the background, the major achievements and the positive impact of President Hu's visit in America. Also we pointed out that the newly emerging problems between China and the United States,which demonstrate the basic paradigm and framework guiding Sino-U.S. relations in the past forty years is not suitable comprehensively. Thus the various contradictions and problems still grim, while various problems cannot be solved alone by a high-visit. Vice President Xi Jinping's visit is the expansion and enrichment of President Hu's visit, while President Hu and President Obama already reached a great consensus. During Vice President Xi Jinping's visit, the consensus of building new model of China-U.S. relations between two national leaders, laid the important ideological basis and practical starting point for the next phase of Sino-U.S. relations. Local and non-governmental exchanges, as well as the military relations, are expected to become important focal points.