The Indigenous Peoples Basic Law Article 3

For the purpose of reviewing and coordinating matters related to this Law, the Executive Yuan shall establish a promotion committee which shall be called by the Premier.Two thirds of the afore-mentioned promotion committee members shall comprise members of indigenous tribes in accordance with their respective proportions. The organization bylaws of the committee shall be made by the Executive Yuan.
中文原文 原住民族基本法第3條
行政院為審議、協調本法相關事務,應設置推動委員會,由行政院院長召集之。
前項推動委員會三分之二之委員席次,由原住民族各族按人口比例分配;其組織由行政院定之。

English translation for reference only; the Chinese text prevails. Not legal advice.