Abstract: This paper analyzes Japan's diplomatic choice in the context of postCOVID-19 SinoUS relations from the perspective of East and West relations. Postepidemic Sino-US relations have increasingly shown the characteristics of the antagonistic relationship between the East and the West. The West has always had a strong sense of superiority over the East, and even often showed a hostile attitude. However, in this epidemic, the West did not perform well. The United States, the leading western country, is ineffective in governance,and was in chaos. To divert domestic discontent, the U.S.began to stigmatize China, leading to the deterioration of SinoUS relations. Under the background of the deterioration of Sino US relations, Japan is under pressure from the United States to take sides, and Sino-Japanese relations are facing a test. Japan's choice is essentially the choice between the East and the West,and it means that Japan's diplomacy is at a crossroad in history. What choice Japan will make deserves attention.

Key words: post-COVID-19, relationship between the East and the West, Neo-Asianism, Japan's choice