Abstract：In sight of the highly-noised，instantaneous and non-stationary characteristics of signal in SHPB test of rock，the wavelet-packets analysis technique is used to de-noise the test signal. Through compare between the wavelet-packets de-noised signal with that obtained from conventional method，it is found that the results gotten through strain gauge filtering and successive-values-averaging method is inaccurate. Wavelet packets analysis，as a new and promising tool in signal analyzing，has good resolution in time and scale aspects. The technique is used to de-noise signal from SHPB test of rock，the resolution is obtained in time and frequency domains simultaneously in multi-scales，and the de-noised results have neglectable errorness，the results turn out to be more reliable.
