The road vibration signal of self-propelled gun when decelerating on rough-terrain is non-stationary.The traditional signal process can not get more useful information.Associated traditional signal process and utilizded the specific localize characteristic of continuous wavelet transform（CWT） in time and frequency domains

the non-stationary vibration properties of self-propelled gun is studied by analyzing the deceleration vibration acceleration signal with time frequency analysis.The result indicates that the amplitude and frequency of the vibration acceleration signal increase along with the raising of the velocity in different work conditions.The wavelet coefficients gray-scale maps of the sampling signal present the regularity of the vibration characteristic as time and frequency changing.The shortage of traditional signal process is overcome.In addition

the scales of CWT in unequal intervals are fixed.This method is effective to analyze high frequency components

but do not impact the accuracy in analyzing low frequency components.