Abstract: For the single-mode compound power-split hybrid system, the main working modes and the characteristics of different gears were analyzed. In the LMS/AMESim environment, the plant models of key components of the hybrid system were established, and the joint simulation model was integrated with the system control model established by Matlab/Simulink through the application program interface（API）. The economic simulation of the vehicle was carried out by the joint simulation model, and the simulation results were compared with the test results of actual vehicle on chassis dynamometer. The results show that compared with the basic vehicle, the comprehensive fuel-consumption saving rate of the hybrid electric vehicle is 38%. The simulation error is within 5%, which is close to the actual vehicle test result. The established plant model has good accuracy, which can serve for system optimization and strategy development. The complicated testing process in the actual development process can be reduced, and the development efficiency can also be significantly improved.