Labor Union Act Article 13

The adoption of a union charter shall be agreed upon by no less than two-thirds of members or members’ representatives who presented at the inaugural general meeting which is attended by one half of members or members’ representatives.
中文原文 工會法第13條
工會章程之訂定,應經成立大會會員或會員代表過半數之出席,並經出席會員或會員代表三分之二以上之同意。

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