Faced on the structural vibration problem of EV powertrain, a simulation method combining mechanical-electrical-magnetic-control integration was proposed，and optimization of control strategy was conducted. Firstly, powertrain model considering motor control strategy，electromagnetic effect and detailed analytical structure was established，which reflects the characteristics of electromechanical integration. Then simulation and experiment of motor current，electromagnetic forces and vibration response were conducted，which prove the correction of the multi-physical simulation method. Lastly, the system was optimized through control strategy improvement instead of mechanical structure modification. Results show that compare with the maximum torque per ampere, the strategy based on predictive model control is more suitable to reduce the surface vibration of EV powertrain. The research results can provide reference to the integration of EV powrtrain system，as well as the improvement of the overall performance.