Abstract: Proposes a new method for the extraction of transient signal waveforms from the noise using wavelet transform and hypothesis testing method.That is wavelet coefficients of mixed signal(signal plus noise) are first computed and the threshold set by hypothesis testing theory is determined.Secondly,wavelet coefficients are compared with the threshold.Those coefficients which are significant are kepe.Finally the inverse wavelet transformation of significant coefficients is performed to obtain the transient signal waveforms.