Abstract: The relationship between stress and AE rate and wave characteristics of AE in laboratory were analyzed in the paper.Based on wavelet transform,the rock AE wave in laboratory was decomposed into high and low frequency signal,then the original AE wave,detailed signal and approximate signal were(analyzed) and compared,and the result showed that wave characteristics of rock AE in different period were not same in the course of rock distortion,damnification and fracture.So it can build AE wave characteristics storehouse which was used to forecast development trend and regularity in the course of rock distortion,damnification and fracture.The error between the original signal and the reconstructed signal of wave(coefficient) containing signal elements was less than 10~-10, which indicated that the wavelet(analysis) can improve accuracy and reliability of forecasting wave characteristics of rock AE.