Abstract: Based on CST software,the models of the heavy current facilities in the subway system are built and the simulation to acquire the distribution of electromagnetic interference(EMI)is completed.Comparing the results of the simulation with the corresponding results of the actual measurement,and then modify the models until the simulation could reflect the situation of electromagnetic field around the heavy current facilities correctly.With the procedure of actual measurement, modeling,simulation,analysis and modification,the minimum distance between the heavy and weak current facilities in the subway station under the normal working condition could be proposed.A more reasonable layout of all facilities could also be acquired so that the resource of the rooms could be saved and the administration of the whole station could be easier.