Abstract: How to detect the edges of image is a very interesting subject.The wavelet trans-form is a very useful tool for signal processing,especially the multiresolution represention are very effective for analyzing the information content of signals.This paper utilizes the property of the wavelet transform and edges,based on the theory of Mallat's characterization of signals from multiscales edges and discusses the method of characterization of signals from multiscales edges about M-band wavelet transform.Using the method,the edges of image can be detected.Experimental results are given,which show that the algorithm is simple,reliable and very useful for detecting edges of image.