The Concert of Democracies is the core concept raised in the report of the Princeton Project on National Security. This concept is a summary of and theoretical annotation to Americas Atlantic strategy. In the AsiaPacific region, the concept is embodied in the forwarding and implementation of the proposal of the fournation alliance of the United States, Japan, Australia and India. In recent years, the United States has strengthened military exchanges and cooperation with the “democratic” countries like Japan, Australia and India. This reflects a deeprooted ideological consideration in US foreign strategy, especially its strategy toward China. If the strategy of establishing a Concert of Democracies becomes a reality, the United States will undoubtedly strengthen its effort in exporting democracy and human rights. As a result, the ideological pressure it exerts on China will increase. Such situation will bring uncertainties to Chinas foreign strategy in the 21st century, and Chinas corresponding adjustment and countermeasures will be inevitable.