In order to study influence factors of impulse waveform distortion of electromagnetic pulse（ EMP）simulator

the model of EMP simulator and its equivalent circuit are founded and the simulation is carried out with transmission line bounded-wave EMP simulator as an example. Transient electromagnetic pulse measurement system is used to measure electric field waveform in experimental area. Experimental and simulation result indicates that simulation result coincide to experimental results. Correctness and validity of simulation model is verified.Simulation result show that: the distributed capacitance Lsrarely affect on impulse waveform distortion

but ground capacitance Czaffect greatly; Matching of terminal impedance with characteristic impedance of transmission line have a great influence on impulse waveform distortion. Peripheral metal plate onside

influence of impulse waveform distortion is great. The larger distance of metal plate to simulator

the smaller influence is; the larger area

the greater influence is. On basis of result of simulation provide basis for optimization design of bounded-wave simulator.