The purposes of this study, based on the literature about prejudice reduction, were to develop a ethnic bias-reducing program in order to reduce student bias towards aborigines, to elevate student critical thinking ability, to reduce student dogmatic opinions, and to increase self-conception of aboriginal students. The research samples were drawn from fifth-graders in Taipei Municipal Ton-Hu Elementary School: 70 students for the experimental group and 70 for the comparative group. Both groups were pre-tested by use of a Likert-style opinion-naire, and were post-tested immediately following the 12-week unit of instruction. The main results are as follows: 1. The instruction of ethnic bias reduction can elevate students' positive impressions of aborigines. 2. The instruction of ethnic bias reduction can't encourage non-aboriginal students to make friends with the aboriginal students in the same class. 3. The instruction of ethnic bias reduction can raise the degree of the non-aboriginal students' consent to the government's favorable policies toward aboriginal students. 4. The instruction of ethnic bias reduction can promote students to appreciate aboriginal cultures. 5. The instruction of ethnic bias reduction can reduce social distance between students and aborigines.