Political Parties Act Article 31

Eligibility shall remain unchanged for legislators-at-large and legislators residing overseas who were selected according to party-list proportional representation in national legislative elections by political parties that have undergone a merger. Vacant offices shall be filled according to the prepared list of the political party to which the office holder belonged prior to the merger and according to the order in which said list was prepared.If an individual party that is involved in a party merger fails to attain the proportion of the total vote stipulated in Paragraph 1, Article 22, that party shall not be eligible for a subsidy, regardless of whether the combined total votes of the merged parties satisfy said stipulated proportion.
中文原文 政黨法第31條
政黨合併者,其依政黨比例方式產生之全國不分區及僑居國外國民立法委員資格,不受影響。
如有出缺時,依出缺人原屬政黨合併前登記之候選人名單按順位依序遞補。
政黨合併者,其各該合併政黨之得票率未達第二十二條第一項之規定者,不因合併後已達第二十二條第一項規定予以補助。

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