The mode of motor is the basis of vibration analysis, which is determined by natural frequency, mode shape and damping ratio. When the excitation frequency of the motor is the same as or similar to the natural frequency of a certain order, resonance will occur, and the motor will vibrate violently, which will affect its normal operation. After the 3D modeling of dualchannel permanent magnet synchronous motor (PMSM) applied in aero electric reverse system, the 3D model is sent to the ANSYS Workbench, and the motor modal analysis, response spectrum analysis and impact response simulation are carried out on the ANSYS platform. The first six order natural frequencies and vibration modes of the motor, the equivalent stress of the motor under the external response spectrum and the stress distribution on the mechanical structure of the motor under the transient impact are given.