Wind power output fluctuation affects its efficiency and power system security. Using energy storage device can reduce the influence of the wind power output fluctuation. The characteristics and efficiency of different energy storage technologies are researched in order to find the available devices for stabilizing wind power output fluctuation. This paper collects and studies various technical parameters of existing energy storage devices, and makes technical and economic comparison of the methods connected to the grid, functions and scale effect. By use of a lot of data analysis and the findings of other related topics, this paper finds out that power grid is the only energy storage system can gather a huge ability of regulate, which is currently the most effective and economical energy storage system. Ultimately it proves that China should develop wind power in the three-north region on a large scale to reduce pollution in energy industry and enhance energy security, while the construction of large power grid is the way of the development of wind power in China.