The Zhuanstyle text carved on Wa-dang (eaves tiles) is a significant element of Chinese culture . These texts are important objects for research on Chinese characters. A three dimensional segmenting method is developed based on curvature theory to extract Chinese characters on Wa-dang. A computer model first with coarse segmentation was constructed and then with a fine segmentation to extract curved text on Wadang. First the curvature of the Wa-dang surface was computed to do coarse segmentation, then clustering was utilized to do fine segmentation. In order to further refine it, a planar point set derived from curvature values was introduced to accomplish fitting of the plane, and then the model was further segmented using the fitting plane. Based on the characteristics of the model itself,local segmentation in multiple planes was achieved. Finally, a parallel thinning subiteration method was used to extract the skeleton line and to thin the segmented model.Experimental results showed that the method used in this paper can effectively achieve 3D extraction of Wadang text.