Use the MZ-4018 wheel-rail friction and wear tester carried on wear test, obtain flap slide rail material wear surface image by microscope and industrial cameras; By the Wiener filter and the Laplace operator method pretreatment method to smooth image and enhance edge and detail information; The iterative method and the maximum between class variance method to determine two threshold, as the standard selection of seeds. Determine growth standards for image segmentation; Finally use morphological methods to extract wear boundary and calculate wear area; Realize the flaps and slats slide rail material wear characteristics of the quantitative analysis.