Taking ”Asia is one”, written by Okakura Tenshin (1862-1913), as a major viewpoint, this article not only refers to preceding research but also examines the ideas held by Tenshin based on related documents and compares the similarities and differences among the viewpoints of all kinds of ”Asianism”. The background and reasons that made Tenshin argue that Eastern culture was superior to Western civilizations will be further explored and the phenomena of ”opposition” and ”integration” will be taken into consideration when Tenshin's Asian outlook is analyzed in order to further explore how to predict the problems that might be encountered while integrating the cultures of the East and West.