Abstract: Accurate fault location is of great significance in improving the safety and reliability of a distribution network.An impedance fault location technology based on a zero-sequence component is proposed. First, a single-phase ground fault can be judged according to the symmetry of line voltages and the amplitude of the zero-sequence voltage. Then the PMU device installed at the bus and the end of the line is used to obtain the steady-state zero-sequence signal after a fault occurs. Then, according to the zero-sequence voltage at both ends of the line, the current at the bus side and the parameters of the line, the fault location equation in each section is established. The pseudo root and real root are distinguished according to the limit of the length of the section. By traversing each section of the system, section and fault location can be realized at the same time. A 10 kV distribution network is built in EMTP/ATP simulation software. The results show that the method can maintain high accuracy under various distribution network structures such as hybrid lines and multi-branch lines, and the ranging accuracy is not affected by the grounding resistance and fault phase angle.