Abstract:Aimed at technical difficulties of parameter analysis method to determine Kaiser point of rock acoustic emission(AE),a new waveform analysis method based on wavelet analysis is put forward. Acoustic emission tests of sandstone specimens under uniaxial compression are carried out using the rock mechanics test,i.e. RMT–150C equipment and WAE2002 acoustic emission instrument. First,AE signal frequency distribution regularity is obtained by means of spectrum analysis based on the testing results,and the signal noise reduction method for AE at Kaiser point is presented. Then,Kaiser point is determined and corresponding waveform signal is obtained according to Kaiser effect and in-situ stress results. Results show that wavelet analysis is an effective way in noise reduction and signal processing of AE at Kaiser point. So the results can be served as the experimental foundation of research on the new waveform analysis method and AE mechanism.