Abstract: A new approach is proposed in this paper to restore fragmentary scanning models by using existing 3D models. Firstly, a 3D model repository of source models is constructed. These source models are derived from existing 3D models, i.e., source models are existing models with selected feature points. Then feature points of the fragmentary model are selected. Correspondences between these feature points and the feature points of the source models are employed to determine one proper source model. Finally, the selected source model is utilized to restore the fragmentary model automatically by means of matching, transformation and amalgamation. Experimental results demonstrate that this method well restores fragmentary 3D models, and the intact 3D models comprise all parts of the original fragmentary models and some other parts as substitutes for the vacancy of the fragmentary models.