To effectively improve the efficiency of distribution network fault analysis and location, reduce economic costs. This paper conducted an in-depth analysis of a variety of fault causes and proposed a distribution network fault location technology based on Lambda algorithm. The algorithm analyzes the data uploaded by the faulty distribution network and feeder terminal, and uses efficient fuzzy search technology to quickly locate the fault location. Experiments show that using the Lambda distribution network fault location technology proposed in this paper to analyze the fault network can effectively reduce the correlation between different ambiguities, which could greatly reduce the iteration of the algorithm, makes the model converge quickly, and improves the efficiency of fault location in the distribution network.