To fully exert the advantage of hybrid vehicles in saving fuel and reducing emissions, an Electro-mechanical transmission system which is mainly composed of double rotor motor and the planetary gear train has been designed and its working mechanism and transmission characteristic based on leverage fast simulation method was analyzed. Vehicle simulation model and torque control strategy was established in MATLAB/Simulink/Stateflow. Simulation results shown that the hundred kilometers fuel consumption in UDDS cycling conditions were 6.227L , with better fuel economy.