This paper studies how Taiwan Pinpu tribes (Pe-po-Hoans) become assimilated as Hakka and Han people. The purpose is to develop a distinction between the "Han-nized Taiwanese" and the "Taiwanese of Han descendants", an aspect that has been overlooked in constructing the nativity of Taiwanese society. This paper calls people of Pinpu origin who later become assimilated as Hakka the "Hakka Pinpu." It finds the three steps through which Pinpu tribes were able to transform themselves completely into Hakkas, an ethnic group of the Han. The steps include adopting a Han surname, creating a pedigree (family tree), and establishing a communal property in the name of the clan for rites to offer sacrifices to ancestors. This study does not only shed lights on regional study of Taiwan society, but also provides an alternative way of thinking the identification of the ethnic group and the culture Taiwanese.