Abstract: This paper mainly studied the terminal load design of bounded-wave simulator using electromagnetic modeling software FEKO.With double exponential waveform as exitation,we studied the electric field waveform in the bounded-wave simulator with different terminal load.The results indicate that simple matched impedance couldn't eliminate the reflection of terminal load completely.The number as well as the location of the terminal impedance has severe effect on the reflection of electric magnetic wave.This conclusion is useful for developing large-scale EMP simulator with 2~3ns rising time.