Abstract: The velocity of moving target is one of important factor affecting the performance of wide-band range profile.HRR radar need velocity compensation in wide-band processing the signal of high speed target. Firstly, this paper in troduces the principle of general wide-band signal mixing processing, then a general transmitting/receiving model is established according to the relationship between the movements of the radar and targets. The response of the moving velocity of the target to the wide-band echoes is derived based on the coherent mixing processing method and a brief velocity compensation method which is convenient for the engineering practice is given at last.