Abstract: To solve the problem that armored vehicles' anti-blast shock performance is not strong, wavelet analysis was used together with time domain analysis to study the frequency distribution characteristics of the peak area of blast shock wave, and analyze the frequency of measured signal. The results show that the shock wave contains a wide frequency range; the noise frequency is mainly concentrated in the high frequency part; the peak frequency of the shock wave is mainly concentrated in the low frequency part, and reveals a exponential growth trend with the peak overpressure.