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This article bases on the realization to the digital image outline extraction research, demonstrated digital image processing the principle, and emphatically to the outline extraction theory, the algorithm as well as the realization carries on the inquisition.In order to realize withdraws a more useful outline, this article elaborated the gradation pretreatment process, again elaborated the realization outline extraction method, including withdraws two realization methods based on the edge examination outline extraction and based on two value method outlines.The gradation pretreatment as well as carries on each kind in this foundation to be possible to realize the outline extraction algorithm inquisition is this article discusses the master line.