Abstract: The electrical and thermal safety of the energy storage system for the reuse of power batteries has become a key factor in the large-scale construction and promotion of the system. It is urgent to build the reuse of power batteries step-by-step energy storage system, study series of safety management methods, and formulate series of safety standards. Specially, it is necessary to establish a comprehensive thermal safety management scheme from step battery monomer to module to energy storage system. Time requires the establishment of a security operation strategy from battery screening to energy storage system building to system operation. On the process, it is necessary to establish the process of electric and thermal safety management and control from safety risk identification and assessment to safety warning analysis to safety plan decision execution. The mechanism of electrothermal safety risk induction and the latest progress of safety technology research for re-used battery storage system are summarized, and the policy standards, demonstration projects and accidents of energy storage system for the reuse of power batteries are combed. The advances and limitations of related safety protection technologies are analyzed from the two aspects of electricity and heat. Suggestions on application policy, safety risk mechanism and safety management technology of power battery step-by-step the energy storage system for the reuse of power batteries in the future are put forward.