In this paper, our research mainly focuses on A Post Automatic Slection System, we analysis its structure and the process of how to realize this system. The first part of the system is the pretreatment of post image and document analysis, including image smoothing, filtering, figure background separation, boundary detection, image translation, document segmentation, run-length smearing, and Hough transform. At last we get post code image and address image from the whole. Then we get off the forms which are around numbers. And segment address image into single words image, which is called handwriting segmentation. In follow, the characters in every block are recognized. Then the result is further understood by using knowledge and Address Library, we get the best result and get out which is the best route of handwriting segmentation. After the process, the information of envelope is imported to computer automatically.
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