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This paper discusses an method based on evidence- theory for the small current comprehensive line selection, this method obtain the signal of small current grounded occurred and use the phase comparison method, Wavelet method, the first semi-continuous wave method and other methods to calculate and determine continuously. Through the evidence fusion rules to fuse Information. Ultimately determine the fault line. Greatly improved the accuracy of the judgement of the fault line. These devices used in the Beijing Electric Power Company for a period of time and be proved effective.