The history of relations among U.S.，Japan and Australia has changed much since the transformation of the Asia-Pacific regional order. There are three linking nodes in the transformation of the Asia-Pacific regional order. One is that Japan rose and challenged the Asia-Pacific regional order in the first half of the twentieth century. Another is the Cold War in the second half of the twentieth century and the third is the rising of China at the beginning of the 21st century. During these periods，U.S.-Japan relations changed from friendship to hostility and then to the building of the alliance. U.S.-Australia relations transformed from friendship to the building of the alliance. Japan-Australia relations changed from hostility to friendship. Now，the further strengthening of U.S.-Japan-Australia relations aims to jointly respond to the rise of China. For China，the United States is the core of the relationship among the three countries. To this end，China should not only guard against Japan，be wary of Australia，but also be careful to handle its relationship with the United States.