Act for Implementation of J.Y. Interpretation No. 748 Article 4

In accordance to the J. Y. Interpretation No.748 and this Act, a union, as stated in Article 2, shall be effected in writing, which requires the signatures of at least two witnesses, and by marriage registration at the Household Administration Bureau.
中文原文 司法院釋字第七四八號解釋施行法第4條
成立第二條關係應以書面為之,有二人以上證人之簽名,並應由雙方當事人,依司法院釋字第七四八號解釋之意旨及本法,向戶政機關辦理結婚登記。

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