With the accelerated construction of new power system for high proportion of new energy access, the needs for power supply with flexible adjustment such as energy storage are more and more urgent. Pumped storage, as one of the most mature and the most widely used energy storage technology with the longest life cycle and the largest capacity, has entered into a fast track of development. The basic principle and development status of pumped storage are introduced, and the latest development trend of pumped storage is summarized. The characteristics and existing problems of power supply are analyzed as well as the application prospect of pumped storage in Sichuan power grid. At last, the application scenes and modes suitable for the practical needs of pumped storage in Sichuan power grid are proposed.