With the coal-fired units large-scale in China and for reducing auxiliary power rate, the draft fan and the booster fan for desulfurization are combined firstly in 1 000 MW unit and driven by the steam turbine. The operation mode, sequential control and automatic adjustment(including stationary blade control, speed control and RB control) change for the turbine-driven fan under various operation conditions of units. Therefore, from the engineering application point of view, the traditional control strategies must be modified by field tests, for achieving the above control and ensuring the safe and stable operation of the units. After repeated trials and optimizations, the auxiliary power rate is reduced 1.27%. The difficulties, key points, problems and solutions during the control are summarized, providing references for other units saving energy.