Abstract: The raw 3D mesh models usually contain some holes and cracks,which are obstacles for subsequent geometry processing and modeling.In this paper an anisotropic hole filling algorithm for triangle mesh models is proposed.First traditional time-costly hole triangulation is replaced by a fast and simple initial triangulation.Then a series of iterative modifications are employed to refine and improve the geometry of hole according to the properties of surrounding mesh.The efficiency,stability and generality of proposed algorithm have been verified by many examples.