A feature-preserving mesh completion algorithm is proposed. Firstly the octree-based subdivision of mesh vertices is created. Piecewise quadratic polynomial functions are used to fit the mesh vertices near the hole. Around the sharp features

two or more quadratic functions with different coefficients are used so as to capture sharp features such as edges or corners. The extended Marching Cube algorithm extracts the triangle mesh patch which is stitched to the hole boundary of the original model to complete the polygon mesh. Finally a feature enhancement process is applied to eliminate the aliasing artifacts to obtain fine sharp features. The results of experimental tests show that excellent hole repairing mesh can be achieved.