The purpose of Morphology is to capture features and attributes of image, such as boundaries and contours. It has been widely applied to computer vision, the analysis and processing of image and even industry examinations and medical image processing. The reason why the Morphology is widely applied is that we can use its simple structure elements to process images, and get up to our requirements. Therefore, it¡¦s become our primary study to find out those suitable structure elements. In this paper, we used the laws of judging the multiple mask relationship to find out filters which came up to the condition that we set, and also came up with an efficient way to find out filters that we want to get.