This study discusses the formation of indigenous identity by combining the theoretical perspective of social construction and identity theory. Based on this premise, campus life, which is constituted officially and ethnographically, was utilized as the research area to study how indigenous identity is shaped and reshaped. By conducting semi-structured and focus group interviews with forty senior high school students, this research analyses how students make sense of 'Indigenous people' presented by textbooks and peers. This study concluded that indigenous students sense the association between themselves and other indigenous people. Given the same reason, they also understand the difference, as well as the distinction, between aborigines and non-aborigines. These research findings indicate that the external environment possibly influences indigenous people to self-identify themselves as 'Indigenous people', highlighting the social factors in shaping the 'Indigenous' identity in modern day Taiwan.