Organic Act of the Mainland Affairs Council Article 5

The Council shall have seventeen to twenty-seven members, all assigned or appointed on a concurrent basis by the Premier of the Executive Yuan.The meetings of the members of the Council shall be convened by the Minister.The Council shall meet to review, deliberate, coordinate, or resolve Mainland policies and important work matters.
中文原文 大陸委員會組織法第5條
本會置委員十七人至二十七人,由行政院院長派兼或聘兼之。
本會委員會議,由主任委員召集之。
有關大陸政策及重要工作事項,需經委員會議審議協調或議決之。

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