Abstract: The installation error of the induced draft fan, wear of the diaphragm coupling, and uneven thermal expansion of the metal material can cause the center data of the coupling to deviate. After the center deviation, it needs to be adjusted during the maintenance process. Through the differences in the center adjustment process between electric induced draft fans and steam induced draft fans, an optimized adjustment method based on the verticality of the wind turbine is proposed for steam induced draft fans during maintenance. Compared with traditional adjustment methods, this method has better results. Taking the center adjustment process of a 1000 MW steam driven induced draft fan as an example, the effectiveness of this adjustment method was verified, providing technical reference for the maintenance of similar equipment.