Electromagnetic noise of induction motor was studied. The reason of an electric vehicle traction induction motor having larger noload noise was analyzed, and the main sources were positioned. Based on the Ansys Workbench multiphysical field simulation analysis platform, the electromagneticstructureacoustic field simulation model was established, the electromagnetic noise of the prototype was predicted. Through the noise spectrum of experimental test comparing with the finite element simulation, the correctness of the simulation analysis of electromagnetic noise was verified. Theoretical analysis of the electromagnetic force wave,which caused the noise of the prototype was carried out, and the electromagnetic noise was suppressed by changing the stator and rotor slot, and the correctness of the method was verified by the noise test.