Because of the different of historical background, the changes of aboriginal structure of community power are very different between the aborigines and the Hans. It is very difficult to find a pure aboriginal tribe or community, because of the move in of the Hans and the intervention of national administrative system. Let me have some interesting questions: Did the aboriginal structure of community power relate with it¡¦s traditional history or not? Or did it tend toward the same structure of community power by government design? These are the key points that this thesis wants to research. So, I want to make use the convenience of knowing my country to research the changes of aboriginal structure of community power by two different case studies of Pinuymayan-LykaBnug and Rukai-Tarumak. Further, that using the comparative approach to research the reaction of two communities shows the different characteristics of changes. According to my research finding: First, the changes of aboriginal structure of community power were influenced with the extent of tradition. Although the intervention of national administrative system, it still didn¡¦t let the changes to be the same; Second, because of the growth and separation of social organization, the social power was changing from centralization to decentralization. And the source of the power elites was from traditional inheriting to local democratic election; Third, today¡¦s aboriginal communities all live some Hans together, and make much competition and cooperation between aborigines and Hans. The elements of influence are including the proportion of population, the growth and decline of position of politics and economy between aborigines and Hans, and the degree of accepting and blending between aborigines and Hans¡Ketc.