This paper compares the differences between battery electric vehicles (BEV) and fuel vehicles, concludes the blind spots in the dynamic evaluation of BEV, and sets up mathematical models of the power performance of BEV, and builds a subjective evaluation system based on mathematical modeling. Test the objective evaluation data of the benchmark model, and subjectively evaluate the test results. The subjective evaluation test shows that the problem of longer acceleration time in the objective performance test of model 2 is mainly caused by the acceleration and deviation of the car in moving, which can reflect the results of the objective test and reflect the true feelings of the driver. The system can be used as the main basis for the evaluation of new BEV on the market. It is worthy of further promotion and research.