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With the upgrading and transformation of power system intelligence, the number and kinds of power big data have begun to show an explosive growth trend, the development of power grid in our country has already entered into the era of big data. How to quickly collect and sort out useful information in the chaotic data pile is a great challenge for the current power system construction. Multi-source information fusion plays an important role in the research of power big data. It can fuse the data information belonging to the research object from various aspects together to realize the sorting out of the disorganized power grid data and obtain a more detailed and comprehensive analysis of the research object. And relying on the mature development of big data storage and processing technology, it provides a new opportunity for the research of multi-source information fusion of power big data.