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We proposed new two methods to separate leakage current of polymeric material for outdoor polymeric insulator into two component such as conductive current and dry band arc current. Leakage current is observed and analyzed using differential value and distortion factor of leakage current waveform. In this paper, two separation techniques were applied the polluted test and evaluation of dry band arc charge were compared each other. As a result, it was considered that differential technique has judgment better than the distortion factor to the separation.