Abstract: The localization of signal could be observed in different scales with the multi-resolution analysis of wavelet transform.Using the statistical characteristic of wavelet coefficient and the quality of noise itself,a method for threshold de-noising in seismic data of blasting was proposed with the characteristic of the signal used to estimate the configuration of the noise.The method could preserve the features of weak components and eliminate the noise of the signal.It was proven theoretically and practically that this method was effective to de-noise in seismic data of blasting.