In view of the frequent failures in the distribution network,how to find out the weak points in the distribution network quickly and efficiently has become a big problem for the safe operation of the distribution network. In this paper, FP network model is used to build the transaction item association matrix, and the data needed to mine association rules is stored in the association matrix to mine association rules.The example analysis proves that the FP-network association rule mining algorithm can be used in the analysis of weak points in the distribution network, and the feasibility of the algorithm is verified through the actual operation of the distribution network and the algorithm .The data only needs to be scanned once, which improves the efficiency of the distribution rule mining of distribution network fault data, is more conducive to real-time update of the distribution network, and provides technical support for the analysis and detection of weak points in the operation of the distribution network.