This study aimed to investigate the development of ethnic identity among Amis children living in Hua-lien County, Taiwan. A clinical interview with tools and an inventory for investigating ethnic identity and attitude were developed specifically for the study. These instruments were administrated to monitor the development of ethnic identity of children whose age was 4,5,7,9 or 11. The study was a developmental research of cross-sectional approach in nature. The main findings in the study were: 1. Children in the age of 4-5 and 7-9-11 had quite different behaviors. In each group, children performed rather similar behaviors. 2. Along with their age getting older, Amis children's ethnic awareness, ethnic differentiation, ethnic self-identification, ethnic behaviors and ethnic distance were scored higher. 3. Amis children's ethnic differentiation was scored higher than Han's. However, their ethnic awareness was scored lower than Han's. 4. Amis children's ethnic images toward Han Children were more positive than those toward Amis children. Amis children preferred being Han people to being Amis. Han's children were the first choice as playmate for Amis children. 5. Most Amis children held affirmatory identity toward their own ethnic group. However, about 14-22% Amis children were in a ethnic identity diffusion situation. 6. Only 17% of Amis children often spoke Amis language in their family. There was rather proportion of Amis children who were not familiar with their ethnic culture.