Abstract: For the problem that the range and distribution of plastic zone expressed by FLAC^3D slicing is usually not intuitive or comprehensive enough, a new method is proposed. This method traverses the model unit, distinguishes the scope of plastic zone, un-plastic and goaf zone automatically, groups units and then gets plastic figure. We verify the validity and feasibility through a specific example. The result shows that the new method can not only display plastic zone in a vivid way, but also avoid the limitation of using multi-plane to give out the plastic zone of goaf surrounding rock.