In view of the problems such as abrasion of stator winding and bearing caused by easy attraction between stator and rotor during the assembly of permanent magnet synchronous motor (PMSM), the specific causes of stator and rotor attraction are analyzed, and a simple and practical stator and rotor assembly process is put forward. The feasibility of the scheme is verified by on-site trial assembly. The stator and rotor assembly technology of PMSM is popularized. It not only solves the problems of winding and bearing abrasion, and improves the assembly quality, but also greatly improves the assembly efficiency of the motor.