The connection of distributed photovoltaic power to distribution network may cause the decrease of the reliability and sensitivity of traditional distribution network relay protection. To solve this problema distributed fault location method based on skewness coefficient is proposed to measure the polarity of transient zero-sequence current considering the multi-branch bus. The distribution characteristics of zero-sequence current when single-phase grounding fault occurs in the distribution network connected with distributed generation are analyzed. Thusthe characteristics of the same polarity of transient zero-sequence current at both ends of the fault section at fault time and the opposite polarity of transient zero-sequence current at both ends of the non-fault section are further obtained. The skewness coefficient is introduced to measure the polarity of transient zero-sequence current and realize the distributed fault location. The simulation results show that the method can be applied to the fault location of distribution network with distributed photovoltaic power supplyand has strong applicability under different fault conditions.