Abstract: Based on the zero-sequence current collected by the existing distribution network SCADA system,a multi-criteria adaptive weight fusion judgment mechanism consisting of "TEO energy-phase mean value-phase variance-phase amplitude effective value" was constructed. Quantitative identification of fault lines was realized through fusion scoring. A simulation model was built in MATLAB and the simulation results show that the fault detection accuracy of this method is over 99.3%, which can meet the engineering requirements of real-time fault detection in distribution networks.