Electric energy storage technology is regarded as one of the core technologies in microgrid，which plays an important role for stabilizing electric power system and utilizing renewable energy with high efficiency. The effect and significance of applying electric energy storage to the microgrid is explained， and the technical features of several energy storage technologies suitable for microgrid， such as flywheel， superconducting magnetic energy storage， super-capacitor and battery， are described. Furthermore， an applying mode of multi-type composite energy storage in the future microgrid is proposed， and some technical issues of applying multi-type composite energy storage are simply analyzed.