Energy storage technology has grown up to be an urgent demand for improving the safety and reliability of conventional power grid，solving the intermittent and instability of the renewable energy power generation realizing the friendly grid connection and coordinating control of the new energy. Also，it cannot be ignored in accelerating the developments of modern power grid system. The current energy storage technologies include pumped-storage，compressed-air energy storage，thermal energy storage，battery storage，supercapacitor storage，flywheels storage and superconductive magnetic energy storage，etc. Among those above，pumped-storage，compressed-air energy storage and thermal energy storage have larger capacity，lower technical costs and longer life time. The future of energy storage technology needs to make the great breakthrough and progress in the aspects of large capacity，low cost，high efficiency，cycle and long service life，safe and reliable，intelligent integration and innovation of materials. At present，the development of energy storage technology in China is in the primary stage. Energy storage industry in China is facing the technical bottlenecks and the challenges of lower cost while it also lacks investment return mechanism.