Abstract: Japan is one of few countries in the world that is homogeneous ethnically,racially and linguistically.However,more than one hundred years ago,the Japanese archipelago under the Bakuhan system was composed of 68 states with different (spoken) languages.The evolution of language policy in Japan over the past 100 years is worth investigating and contemplating.In this study,the evolution of Japanese language policy during this period was explored in terms of the emergence and establishment of its “National Language”,the promotion and popularization of National Language (standard language),the reform in National Language after World War Ⅱ and internationalization of the Japanese language.The study facilitates our understanding of the changes in Japanese society,language and culture and enlightens us with historical insights.

Key words: Japan, language policy, National Language, evolutionary approach