Abstract: According to the different characteristics that signal and noise exhibit during the wavelet decomposition,a new denoising method based on the lifting scheme wavelet packet decomposition is presented.In this method,the SAR images are decomposed by using the best wavelet packet and the norm of each sub-band are calculated,signals and noise can be discriminated based on the norm and soft-threshold method,and the images can be denoised.Experimental shows that the proposed algorithm is of excellent performance in denoising SAR images,and can remove most noise of images with well-kept texture details information.The calculating speed of the method is twice the speed of the general wavelet packet transform algorithm.