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As the basic geomorphologic unit for the occurrence of geological hazards, slope unit is widely used in the prevention and evaluation of landslide-based geological hazards. Its extraction is the primary target and important foundation for the risk assessment of landslide hazards. A new slope unit extraction method based on improved marked watershed is proposed in this paper. Firstly, the DEM image is segmented by marker-based watershed to extract mountain objects. Then the positive and negative terrain of the mountain objects are segmented by watershed to extract ridge lines and valley lines. Finally, these lines are superimposed to extract the slope unit. The experimental results show that slope unit can be extracted by this method. Compared with the traditional GIS methods, horizontal planes and inclined planes can be segmented correctly, and the problem of parallel boundaries caused by filling of depressions can be effectively avoided through this method.