Futures Trading Act Article 110

If the arbitrators selected by the parties to the dispute cannot agree on the appointment of the third arbitrator as provided under the agreement to arbitrate, the Competent Authority may appoint the third arbitrator upon application or ex officio.
中文原文 期貨交易法第110條
爭議當事人選定之仲裁人不能依協議指定第三仲裁人時,主管機關得依申請或依職權指定之。

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