Arcgroundingfaultsoccurfrequentlyin powersupply and distribution system with effectivegrounding neutral point. Existing faultdetection methods are insufficientwhen arc dissipation power is smalland zero resttime is short, resulting in low detection accuracy. In orderto solve this problem , the zero sequence currentofthe faultbypass is used to identify the fault. Firstly, for the arc grounding fault, the formation mechanism of zero sequence current of fault bypass is explored, and the transmission effectof arc fault characteristics to faultbypass signal is revealed. Then, the gradientproductand correlation coefficientindex are used to describe the zero sequence current signal characteristics of the faultbypass, and theidentification criteriaisestablished. Finally, Simulation resultsand experimentaldataverifythe effectiveness of the proposed method. Comparative analysis shows that the proposed method has higher recognition accuracythan theexisting methods. Especiallyin thefaultscenario wherethearcdissipation powerislessthan2×103 W and the zero-offfeature is notobvious, this method has more advantages in recognition. The proposed method expands the arcfaultidentification method, and can be used to preventelectricalfires caused by arcfaults.