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Suppression ability and edge2preserving ability are two important indexes to evaluate a filter algorithm.Proper parameter is used to measure the former , but usually only subjective judgment by human eyes can be used in evaluating the latter one. Edge similar degree parameter was defined to measure the edge2preserving ability of a filter algorithm in the paper based on the similarity between the position of edge point s in standard edge image and the
edge image to be measured. The parameter was used to compare the filter algorithms in processing Gaussian noise affected images and salt & pepper noise affected images. Prospective result was gained and approved that the parameter value measured exactly the edge preserving ability of filter algorithms. The edge2preserving ability of speckle noise filter algorithm is very important to laser radar image. So , the edge similar degree was used to measure the edge2preserving ability of speckle noise filter algorithms. The result showed that Lee filter algorithm and enhanced Lee filter algorithm have preferable edge2preserving ability. The edge2preserving ability of average filter and median filter is dissatisfactory.