Aiming at the problems of complex fault location method, poor reliability and high equipment requirements of existing distribution network, a fault segment identification of distribution network based on zero-sequence current distribution characteristics is proposed by means of low-sampling and low-cost fault indicators method. Firstly, the composition and distribution characteristics of zero-sequence current in different locations and different neutral grounding modes of the line are analyzed qualitatively. Then the difference between the zero-sequence current amplitude of the healthy section and the fault section in each case is derived quantitatively, thereby constructing the fault segment identification criterion. Finally, combined with the zero-sequence current distribution feature and the clustering process, the fault line is determined by the ratio of the distance between the last two classes, and the fault segment is determined according to the last two types of boundary numbers of the fault line. The method is simple and effective. The 10 kV low-current grounding system is built in PSCAD/EMTDC for simulation verification. The results show that the proposed method has nothing to do with the initial phase angle of the fault and has strong anti-interference ability, and is not affected by the fault resistance and fault location.