By analyzing the shape characteristics of the impeller passage area, HyperMill was used to generate the layered and divisional tool pathfor the impeller rough machining. The step distance of impeller passage finishing was calculated, and the impeller finishing program was generated. Through cutting simulation experiment, the cutting force of the impeller finishing was analyzed, and the cutting parameters of the impeller finishing were optimized. The impeller machining efficiency and quality are improved by using the method