Immigration of Overseas Chinese has a history of more than one hundred years in Japan. Overseas Chinese, as immigrants, are not fully assimilated into Japanese society but they have formed their own cultural identity by inheriting the native language and culture. Because there are overseas Chinese schools as a place of ethnic education, overseas Chinese are capable of forming their ethnic communities in Japan, a racially homogeneous nation. In order to analyze the role of overseas Chinese School in adaptation process of Japanese society, fieldwork was conducted mainly in Tokyo, Yokohama, Osaka and Kobe which these areas are characterized by being a residential district of overseas Chinese. And in-depth interview was carried out 10 participants who were graduated from overseas Chinese school. The school which has become a major education facility is a positive factor for integration in Japan, and it also has a significant impact on cultural exchange between China and Japan. In particular, as ‘multicultural co-existence’ is a new issue of Japanese society, the school provided trilingual education and cultural education of China and Japan performs key roles in uniting Chinese communities, as well as in acting a catalyst for leading multicultural co-existence in Japan. And the school is not only the fulcrum to maintain and develop the overseas Chinese community through education of mother tongue and traditional culture, but also the link between Chinese community and China. Moreover, the school is the symbolic mechanism to embody homeland in Japan.