自從1946年日本國憲法誕生以後，沒有權力的象徵天皇就成為學界熱門討論的議題。日本國憲法將天皇定為「日本國民統合的象徵」，故如何理解象徵天皇的政治效應，也就成為討論焦點。沒有權力的君主為何能產生政治效應？如何才能有效發揮政治效應？本文將中國政治思想有關「勢」的討論當作分析工具，探討這些圍繞象徵天皇政治效應的問題，進而提供在象徵天皇的理解上與以往的研究不同的視角。同時，本文也是中國政治思想研究的一種嘗試，將中國政治思想的討論應用到現代政治的議題上，以期揭示中國政治思想的重要性及有效性。

The symbolic Emperor of Japan, a monarch without power, has emerged as a prominent subject of academic discourse since the Constitution of Japan was promulgated in 1946. The Constitution of Japan regulated the power of the Tenno (the Emperor of Japan) and defined his position as “the symbol of the unity of the people.” Therefore, a key point of discussion is how to recognize the political effects of the symbolic Tenno. How can a monarch without power produce political effects? How can these effects be maximized? This essay examines these questions using the theory of shi (勢), which was built in the realm of Chinese political thought, providing an unprecedented viewpoint for understanding the political power of the symbolic Tenno. Furthermore, since this study applies Chinese political thought to an issue of modern politics, the importance and validity of Chinese political thought is verified.