The electromagnetic-like mechanism（EM） algorithm has good effect in processing data of sensor feeder terminal unit（FTU） on fault section location of distribution network

but there are some problems such as parameter sensitivity

charge overflow and particle falling into local optimum.The particle component exchange searching method is brought in and the formula for particle charge and force and step are improved.In consideration of flexible operation

the large scale of distribution network is divided into several distribution network module according to the loop switches

then the modules are weighted

thus a new model which can improve operation efficiency of the diagnosis algorithm is built.The simulation results show that compared with standard EM algorithm

the improved EM algorithm which only needs fewer population and iteration numbers can quickly realize data processing of sensor FTU and fault section location of distribution network.