Abstract: In order to improve operation speed and fault tolerance capability of fault location system of distribution network, a fault location method for distribution network based on Petri net and double criterion was proposed. Fault diagnosis was done according to voltage criterion and current criterion, and error correction of redundancy information was achieved through double criterions and probability information. Structure and the definition of Petri net combined with probabilistic information was introduced firstly, and then general Petri net model of fault location was established, finally, validity and feasibility of the proposed method were validated by simulation of fault localization procedure of distribution network with two standard wiring modes.