Abstract: Shared energy storage on the generation side is widely concerned because it can improve the flexibility of new energy stations and the utilization rate of energy storage, but its large-scale development is hindered by the immature operation mode. The study of shared energy storage operation mechanism and trading model is important to support and encourage the participation of multiple energy storage units in energy sharing, and is also a current research hot spot. To this end, the operational mechanism and trading mode are sorted out and analyzed, and the operational mechanism of distributed and centralized shared energy storage under different investment and construction purposes of demand satisfaction and interest drive are discussed. On this basis, the current trading model of shared energy storage is summarized from two perspectives: non-cooperative game and cooperative game. And the development direction of shared energy storage in the evolution of the future power grid is discussed and foreseen, in order to provide a reference for the research and technology application of the synergistic development needs for the power grid, new energy storage, and energy storage in the new power system.