Organic Law of the Control Yuan Article 6

The president of the Control Yuan shall oversee the affairs of the Yuan and supervise subordinate agencies. If the president is unable to perform his or her duties for any reason, the vice president shall act on his or her behalf.If the presidency of the Control Yuan is vacant, the vice president shall serve as substitute up to the day that a successor president is nominated and appointed by the President following confirmation by the Legislative Yuan.If the positions of the president and vice president of the Control Yuan are vacant at the same time, the President shall designate one member of the Control Yuan to serve as substitute up to the day that a successor president and vice president are nominated and appointed by the President following confirmation by the Legislative Yuan.If the positions of the president, vice president or member of the Control Yuan are vacant, the term of the successors to these positions shall expire on the last day of the original term of service.