The main problem in nanosecond pulse signal measurement is narrow bandwidth and distorted waveform.Based on the square wave calibration data of the measurement system,a difference equation model and a convolution model of the measurement system are established,which are used in the actual test of the double exponential pulse waveform prediction and reconstruction for signal processing.Model results show that the convolution model is more suitable than differential equation model in the nanosecond pulse waveform prediction and reconstruction.