Local Government Act Article 11

Members of the provincial consultative council shall serve a three-year term and shall not receive remuneration. The number of council members shall be determined by the Executive Yuan on the basis of the area and constituent population of the jurisdiction and the needs of the provincial government operations. The council shall be composed of not less than five (5) and not more than twenty-nine (29) members; a chairperson who shall be in charge of council affairs shall be appointed from among the members of the council. Council members shall be nominated by the Premier and shall be appointed by the President.
中文原文 地方制度法第11條
省諮議會置諮議員,任期三年,為無給職,其人數由行政院參酌轄區幅員大小、人口多寡及省政業務需要定之,至少五人,至多二十九人,並指定其中一人為諮議長,綜理會務,均由行政院院長提請總統任命之。

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