Government Procurement Act Article 25

An entity may, depending on the characteristics of an individual procurement, specify in the tender documentation to permit joint tendering by a limited number of suppliers.The term "joint tendering" referred to in paragraph 1 means the activity of two or more suppliers participating jointly in tendering, executing jointly the procurement contract after being awarded, and assuming the joint and several liability thereunder, with a view to contracting for construction work or to supplying property or services.Joint tendering shall only be permitted where it can increase the competition among suppliers or not restrain competition without due cause.A joint tendering by suppliers of the same line of business shall meet the requirements set forth in each of the subparagraphs of paragraph 1 of Article 15 of the Fair Trade Act.Suppliers participating in a joint tendering shall submit a joint tendering agreement along with the tender.The regulations for joint tendering shall be prescribed by the responsible entity.
中文原文 政府採購法第25條
機關得視個別採購之特性,於招標文件中規定允許一定家數內之廠商共同投標。
第一項所稱共同投標,指二家以上之廠商共同具名投標,並於得標後共同具名簽約,連帶負履行採購契約之責,以承攬工程或提供財物、勞務之行為。
共同投標以能增加廠商之競爭或無不當限制競爭者為限。
同業共同投標應符合公平交易法第十五條第一項但書各款之規定。
共同投標廠商應於投標時檢附共同投標協議書。
共同投標辦法,由主管機關定之。

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