In order to gain the true wave form of signals detected by IR/MMW sensors of terminal sensitive projectile(TSP), enhance the recognition rate, in view of the experimental data obtained by tower cast experiment, combined with IR/MMW's detection principle and signal feature, suitable wavelet function, decomposition scale and threshold value were chosen for de-noising work, true wave form was got. The results show that wavelet denoising method can be better used for smoothing signals gained by IR/MMW sensors of TSP, and the de-noise signals can be referred for target identification template of TSP.