The purpose of this article is to analyze the problems of the relationship between Professional Graduate School and in-service teacher education, and to propose the policies of establishment new Professional Graduate School. The in-service teacher education in Professional Graduate School aims to acquire the higher quality of the professional competency through the integration of the related theories and practices. The Education Faculty of Hiroshima University has the good traditional educational system. Therefore, The new system needs to be established on the traditional system. However, in the new system, there are many outreach activities of teachers of graduate school to enhance the school outcomes.