Japanese academic circle has been doing Chinese study for a long time, so there are many different points of view in their understanding of China. This thesis tries to provide one aspect of those through the research of Mitsuyuki Kagami, and also tries to offer a way of thinking for nation study in Taiwan through Mitsuyuki Kagami’s study of methodology. The research methods in the thesis are text analysis and interview. We arrange his academic thinking by finding out how he generated the views on China from his intellectual evolution, and by analyzing his academic productions. We can know how Kagami thinks of himself from the interview and can dig out his potential awareness through text analysis. As a scholar doing Chinese study, he tries to solve the problems between China and Japan nowadays by discussing methodology of Chinese study, and bring out “co-behaviorism”, nation study, and the return of the concept, “the metaphor of mirror”.