In the experimental studies of social sciences, the racial relationship aims at the study on the position of racial structure in politics, economic, language and culture. This study, therefore, tries to explore the racial relationship between the Hakka and the aborigines in Taoyuan, Hsinchu and Miaoli areas after World War II. The study will focus on: (1) the distribution of the Hakka in the areas after World War II; (2) the distribution of the Aborigines in the areas; (3) the racial relationship between these two groups in the fields of language, education, culture, economic as well as enterprises.