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For hybrid electric vehicles, energy saving and emission reduction are the main reasons for their development, and energy management strategy is the key technology for energy saving and emission reduction. Therefore, research on the energy management strategy of parallel hybrid electric vehicles is carried out; First, using ADVISOR electric vehicle simulation software, select a certain parallel hybrid vehicle, and use the standard ECE_ECDU and UDDS cycle conditions to evaluate the fuel economy and pollutant emission effect of the whole vehicle; Then, the method of threshold parameter optimization is used to optimize the control strategy; Finally, the changes of the fuel economy and emission performance of the vehicle in the simulation results of different cycle conditions before and after the optimization are compared, and the influence of the optimized strategy on the vehicle performance is analyzed; The research shows that the proposed optimization method can reduce the fuel consumption per 100 kilometers of the car in the ECE_ECDU and UDDS cycle conditions by 8.45% and 10%, respectively, and the harmful gases HC, CO and NOX content by 5.88% and 5.8%, 12.24% and 11.54%, 8.55% and 7.51%, further verifying the effectiveness of the optimization strategy.