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Edge detection is a basic content in image processing and computer vision, which is still unresolved till now.Now most of image processing aim at the digital image, this paperintroduces and analyzes several typical methods of edge detection in digital image. It introduces a demonstration system of edge detection which contains image files, image edge detection. The main contribution of this paper are: Part 1: Introduce the base of image edge detection. Part 2: Analyse and design the demonstration system of the Edge Detection. The main content is the introduce of the developing instrument and the detailed analysis process. Part 3: The result and prospect of the demonstration system.