Abstract: The local statistical properties of synthetic aperture radar(SAR) image are used in many speckle filtering methods,and a boxcar filter must be used.Generally,a square window with odd number of pixels width is used as the local window,but it may smear edges and details.The nonsquare edge-aligned local windows with subwindows are proposed,which can despeckle and also preserve image edges and details.Besides,they have low computation complexity,easiness of realization and better practicability.