Organic Law of the Control Yuan Article 9

The Control Yuan shall have a specially-appointed secretary general in charge of managing the routine operations of the Yuan and directing/supervising its staff under orders of the Yuan president. The secretary-general shall be assisted in conducting the routine business of the Yuan by one deputy secretary-general at Level 14 of the Selected Rank, under orders of the Yuan president.
中文原文 監察院組織法第9條
監察院置秘書長一人,特任,承院長之命,處理本院事務,並指揮監督所屬職員;副秘書長一人,職務列簡任第十四職等,承院長之命,襄助秘書長處理本院事務。

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