In view of the problems that the current traction battery system has not yet established a sound testing and evaluation standard system and the testing technology lags behind the development of the industry, the traction battery system testing and evaluation standard system is discussed and the key testing technologies are analyzed. Based on the current domestic and foreign traction battery testing standards, the traction battery testing and evaluation standard system covering electrical performance parameter testing, safety performance testing, life testing and battery management system testing has been preliminarily constructed. And the methods and ideas for key testing technologies of traction battery such as the testing and evaluation of key parameters under dynamic working conditions, the safety test of local thermal runaway of thermal diffusion, and the functional safety evaluation of battery management system are also provided, laying a solid foundation to achieve traction battery system testing.