The engine cannot exert the peak torque if the parameters of motors are not match well in a power split hybrid vehicle. In such a case

the engine is working at a speed so that it has the ability to exert its peak torque while the motor limits the torque of engine due to the working points of motors. To solve this problem

a novel strategy is proposed for the parameter matching of the dual-mode power split transmission with the optimum of the power output characteristics as objective. The motors' maximum speed and torque are matched on the basis of the analysis on the characteristics of the dual-mode hybrid transmission. The relation ship between the motors' rated speed and the engine working points is studied with the help of analysis on the characteristics of electric power split

and the method for the motors' rated speed matching is put forward. The validity of the matching method is validated by matching examples. Finally

the motors and the engine performance are analyzed and the results show that the power split transmission can exert the peak torque of the engine and motors at the same time by coordinating the working points of them.