Civil Associations Act Article 28

Where a civil association has three hundred or more members (member representatives), the organizational area may be subdivided to elect representatives according to the percentage of members (member representatives) and to call a representative’s assembly to perform the duty of the member’s assembly.The division of organizational area and the number of representatives in the above paragraph shall be reported to the competent authority for reference.
中文原文 人民團體法第28條
人民團體會員(會員代表)人數超過三百人以上者,得劃分地區,依會員(會員代表)人數比例選出代表,再合開代表大會,行使會員大會職權。
前項地區之劃分及應選代表名額之分配,應報請主管機關核備。

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