With further promotion of energy saving, the induced draft fan merges with the desulfurization booster fan in No.3 and 4 units of a power plant, and the fan is driven by turbine instead of the electric motor. The control strategy of furnace draft, special plumbing configuration, parallel tests for fans and abnormal condition analysis are discussed in this paper, proving that the fan driven by turbine is innovative and controllable. It provides references and is worth while popularizing its application from the type selection, debugging, running and refomation of auxiliary engines in large-scale power plant.