<p>The traction motor in the traction drive system realizes the conversion between electrical energy and mechanical energy, and its operation reliability determines the safety and stability of high-speed train operation. The traction motor turn-to-turn short circuit fault would occur when the insulation layer of stator winding is damaged, which would cause the motor output torque pulsation and further cause the vibration of bogie components through transmission of the transmission system. In order to study the dynamics of traction motor turn-to-turn short circuit fault on bogie of high-speed train, an electro-mechanical coupling dynamic model for high-speed train and a traction motor turn-to-turn short circuit fault model were established. The dynamics responses of the longitudinal, lateral and vertical acceleration on bogie components, such as motor hanger, gearbox housing, axle box and bogie frame were quantitative analyzed. The results showed that when the turn-to-turn short circuit fault occurred in the traction motor, the amplitude of the motor output torque increased, and the torque pulsation of twice the motor supply frequency could be generated. Twice the motor supply frequency was observed to have significant effects on the longitudinal and vertical directions of the bogie components, but little impact on the lateral direction of the bogie components.</p>