Abstract The importance of batteries for electric vehicles is equivalent to the importance of the heart to people. The battery can provide energy for electric vehicles and increase the power for electric vehicles. It is for this reason that electric vehicle manufacturers, drivers and maintenance plants need to have a deeper understanding of the performance of electric vehicles. This is not only to extend the battery life of electric vehicles, but also to speed up the work and improve the efficiency of the work by the driver or the repair shop as soon as the accident occurs. The focus of this paper is to explain the methods and precautions for testing the electric vehicle system with the performance of the power battery, and strive to play a positive role in the development of the power battery of the electric vehicle.