Act Governing Relations between the People of the Taiwan Area and the Mainland Area Article 42

Where the provisions of the Mainland Area shall apply in accordance with the provisions of this Act, the provisions of the place of the party's household registration shall apply if there are different provisions in different places of the referred Area.
中文原文 臺灣地區與大陸地區人民關係條例第42條
依本條例規定應適用大陸地區之規定時,如該地區內各地方有不同規定者,依當事人戶籍地之規定。

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