A large number of distributed generations are connected to the distribution network, which makes its structure complex and changeable, resulting in the impact on the efficiency and accuracy of fault location of standard genetic algorithm.According to the actual situation of distribution network operation, a fault location mathematical model is built, and the switch function and evaluation function of standard genetic algorithm are improved, which improves the fault tolerance and accuracy of the algorithm.At the same time, the concept of hierarchical processing of distribution network is introduced to partition the distribution network, dividing the whole distribution network into several independent regions, which shortens the dimension of solution in the algorithm and improves the efficiency of algorithm location.Finally, different fault types are simulated by MATLAB.The results show that the improved genetic algorithm has good faulttolerant ability in the distribution network with distributed generators.The simulation time and accuracy are analyzed.The results show that the algorithm has high operational efficiency and accuracy.