Abstract: In order to reconstructing an ancient tomb of Eastern Han Dynasty,this paper transforms 3D polygonization into 2D situation taking use of the correspondence of 2D picture points and 3D points,and selects generating range,seed point by hand to calculate the difference of sets,determines generating range,maintains the seamless contiguity of TIN,and at last makes the surface model successfully.The authors also make an experiment on a vase and get a good result.