3D object fusion is a new geometric modeling tool. It provides an easy and fast way to generate novel models from two or more existing geometric models by using 3D cutting and pasting operations. A new montage mesh fusion method is proposed based on local harmonic mapping in this paper. The approach first extracts mesh regions to be fused by approximating offset curves on meshes, then parameterizes the regions using harmonic mapping with holes, and the smooth mesh fusion is finally obtained by topology combination and fusion control. Compared with the global harmonic mapping method, this approach has the following advantages. (1) The efficiency of the algorithm is greatly improved. The computational cost involved no longer increases exponentially with the number of vertices of the meshes to be fused. (2) The algorithm is robust as the ambiguity in graph structure combination is alleviated. (3) The detail of the cut mesh is fully kept. (4) The topology restriction of the original algorithm is eliminated. Experimental results show that the new approach can be used to create lots of special exaggerated modeling effects for computer animation, thus it is of import value in film and TV industry.