Abstract: Echo modeling and simulation in a PD fuze target simulator for phase modulation by pseudo random coding are studied.A model of fuze target is built up with equivalent scattering point.Interaction between scattering points is discussed and shadowing is treated with approximation.The cluttering area wherein the fuze antenna illuminates is distributed into small clutter cells and the clutter modeling is built up as the method of fuze target echo modeling.Validity of the model of fuze target and clutter were proved by simulation results.