Based on theoretical and experimental research, this paper constructs a rapid test method for estimating the accuracy of the range of pure electric vehicles based on CLTC-P, which is based on different environmental temperatures, air conditioning use, test scenarios, and high-speed operating conditions. The article further compares and analyzes a variety of mathematical statistical methods and selects certain coefficients to evaluate the accuracy of cruising range estimation, and proposes a general rapid test method and evaluation theory of cruising range estimation accuracy, which lays the foundation for establishing a unified assessment standard in industry, and promotes the development of the electric vehicle industry.