Abstract: To effectively improve the efficiency of distribution network fault analysis and location, reduce economic costs, this paper conducts an in-depth analysis of a variety of fault causes and proposes a fault location technology of distribution network 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. Experimental results show that using the proposed Lambda-based fault location technology of distribution network can effectively reduce the correlation between different ambiguities, which could greatly reduce the numbers of iterations and search times of the algorithm, and improve the efficiency of fault location in the distribution network.