Australia-U.S. Relations in the year of 2021 further deepened in backgrounds of the COVID-19 pandemic as well as the continuous rise of China’s national power. The U.S. and Australian governments devoted numerous resources to strengthen their strategies ties with allies in Asia，Europe，and South Pacific. Even though controversies were aroused by Washington and Canberra’s unliteral decisions，new security initiatives to uphold America’s military predominance in the Indo-Pacific region were created. Such scenario may to a certain extent put more pressure on the Chinese government which aims to pursue a more favorable international environment.