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The produce causation and the development direction of the distributed power and the far-reaching meaning of constructing China characteristic Smart Grid are introduced in this paper. The influence to the traditional transmit electricity net protection under the background of the distributed power being connected on a large scale and the emphases attention technic problems are analysed emphatically. The tiny net technic is explored, which is the main method of the distributed power connection and bring into play its efficiency. Finally, the development aim of the Smart Grid protect system is prospected.