Abrasive flow machining (AFM) was proposed to solve the problem that the burr in the rotor channel could not be completely removed. The 3D model of abrasive fluid was established. The pressure distribution in the center of channel bottom hole and at the edge of the channel was analyzed by Fluent. The workpiece clamping scheme was designed. The results of deburring experiment show that the channel wall is smooth, surface roughness value does not change significantly, dimensional accuracy is not affected and residual burr is removed effectively.