Abstract:This paper briefly introduces Arata Isozaki’s urban ideologies, focuses on his theoretical proposals, exhibition works and writings since the 1960s. It analyzes how Isozaki started from the concept of “ruins” and gradually formed the process planning theory, and through three ocean-related urban proposals in the 1990s, constructed the concept of “archipelago” city. It also presents his rethinkings of architecture, cities and social forms in the era of globalization, as well as the cosmopolitanism associated with it. In this way, it revisits Isozaki’s life, which began amidst the ruins and concluded in the sea.