An energy management optimization model was established, which took state of charge (SOC) as the state variable, rear drive motor and integrated starter and generator (ISG) motor torque as the control variables, and the minimum fuel consumption of the vehicle as the goal. Then, the solution flow of the above optimization problems was designed based on pontryagin's minimum principle. Finally, based on the simulation model of the whole vehicle system, the energy management control was simulated. The simulation results were compared with the simulation results of the charge depleting (CD) and charge sustaining (CS) mode rule control strategy. The results show that compared with the CD-CS mode rule control strategy, the proposed energy control strategy reduces the fuel consumption by 28.18% per 100 km, showing efficient fuel saving potential.