Abstract: A method for image zooming based on thinned edge was proposed this paper.First, thinning the preliminarily edge that was distilled to get the exact location of the edge, give the edge pixel and non-edge pixel different marks;then according to the edge point and non-edge point quantity and the position relations around the interpolation pixel take different interpolation processing.The experiment proved this method obtains the image that has fine visual effect, after enlargement the image edge is clear, without obvious denticle phenomenon.The processing algorithm is simple and easy to realize.