With the development of information technology, informationization of electric power enterprises is accelerating, the power exponential growth of scale, and big data is the product of power informatization, its technology plays an increasingly important role. This paper first introduced the power of big data and related technologies, and from the power load prediction, grid architecture planning, dynamic security assessment and maintenance decision support four aspects, discussed application of power data in the power grid planning and management, and analyzes the power of big data in the development process of the face of opportunities and challenges, to provide ideas for further research.