An energy management optimization model, which takes state of charge (SOC) as the state variable, rear drive motor and integrated starter and generator (ISG) motor torque as control variable, and the minimum fuel consumption of the vehicle as goal, was established. Then, the solution flow of the above optimization problem 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 the proposed control strategy has good fuel economy. Compared with the CD-CS mode rule control strategy, the proposed control strategy reduces the fuel consumption by 28.18% per 100 km.