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In order to reduce the complexity of the target recognition and improve their noise immunity, a geometric-difference based recognition method is presented. First, exact contour of target picture after image processing, and construct approximate polygon outline of target image using a minimum perimeter polygon method. Then zoom in the two polygons according to standard targets in template library to get the same area. And make target contour parts overlap with standard contour using the placement algorithm. After that, we introduced a new algorithm called modified two-way chain table algorithm to get intersection area, and recognized the target according to intersecting area. The simulation experiments show that this method is simple and can quickly identify the target. 