Organization Act of the Council of Indigenous Peoples Article 3

There is one specially appointed Chairman on the Council (the Minister). The chairmanship shall alternate between a person of mountain indigenous and plains indigenous origin. There are three Deputy Chairman (deputy ministers) on the Council, two of whom shall have a rank equivalent to grade fourteen while one shall have the rank of grade fourteen. Among the three Deputy Chairmen, two shall be mountain or plain indigenous persons, with the Deputy Chairman holding the grade fourteen rank being a mountain or plain indigenous person.
中文原文 原住民族委員會組織法第3條
本會置主任委員一人,特任,由山地原住民與平地原住民輪流擔任之;副主任委員三人,其中二人職務比照簡任第十四職等,另一人職務列簡任第十四職等;副主任委員中,二人應由山地原住民或平地原住民擔任,且職務列簡任第十四職等者,應具山地原住民或平地原住民身分。

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