Basic Code Governing Central Administrative Agencies Organizations Article 21

The term of office, and proceedings for the appointment, suspension and discharge of commission members of independent agencies shall be clearly stipulated. Nominations for full-time commission members of second-level independent agencies must be submitted to the Legislative Yuan for approval. For other independent agencies, commission members shall be appointed by the head of first-level agency.When making appointments mentioned in the preceding paragraph, the head of first-level agency shall designate one of the members as head of the agency and another member as deputy head.The number of commission members referred to in Paragraph 1 shall be five to eleven in principle unless otherwise required. The number of members belonging to the same political party shall not exceed a certain proportion.
中文原文 中央行政機關組織基準法第21條
獨立機關合議制之成員,均應明定其任職期限、任命程序、停職、免職之規定及程序。
但相當二級機關之獨立機關,其合議制成員中屬專任者,應先經立法院同意後任命之;其他獨立機關合議制成員由一級機關首長任命之。
一級機關首長為前項任命時,應指定成員中之一人為首長,一人為副首長。
第一項合議制之成員,除有特殊需要外,其人數以五人至十一人為原則,具有同一黨籍者不得超過一定比例。

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