Abstract: The rapid development of renewable energy has a strong influence on the construction of new-type power system. However, the high variability and uncertainty of renewable energy have a greater impact on ensuring the reliable operation of the system. In order to achieve multi-time scale energy supply, energy storage system plays a key role in the construction of new-type power system. The energy storage technologies faced by the new power system are summarized, and the traditional energy storage technology is organically combined with the grid-connected control strategy, the grid-forming energy storage system is introduced. Moreover, the basic architecture and principle of grid-forming energy storage system are briefly reviewed. On this basis, the dynamic characteristics, principle of control technologies and main problems of the grid-forming converter, which is the key link of the grid-forming energy storage system, are investigated. Finally, combined with the existing research results, the main problems and possible solutions of grid-forming energy storage system for the stable operation of new-type power systems are summarized.