Abstract-The Doppler effect of UWB signal and the influence on Fuze receiver output signal is quite different from the sinusoidal narrow-band signal.It is necessary to find the relationship between the frequency of fuze receiver and the projectile target approaching velocity.The article study the time domain Doppler effect of UWB fuze receiver,derivation the expression of fuze receiver input、 output signal,simulation the frequency relationship according to the mathematical model of UWB fuze receiver.The simulation results shows the output signal of the UWB receiver is proportional to the projectile target approaching velocity and input frequency, The output signal of the UWB receiver is inverse ratio to the width of fuze transmit pulse signal.Keywords-Ultra-wideband fuze;Ultra-wideband signal;time domain Doppler effect;Fuze receriver;projectile target velocity I.INTRODUCTIONS