Abstract: For?the?problem?of?three-dimensional?model?reconstruction?of?human?facial?skull, a triangular mesh piece-fitting surface algorithm (TMPSA) is proposed to improve the reconstruction quality of the?facial skull model. Firstly, according to the complexity of facial skull surface, ?the?point?cloud?data?segmentation?method?of facial?skull?multi-surface?slice?is proposed and mapped to the corresponding plane. Secondly, the triangle mesh method of the slice data is introduced to establish the triangle mesh model. Then ,?the?triangular?mesh?plane?is?mapped?back?to?three-dimensional?space?and?the?surface?is?fitted.Finally, the surface of the skull surface is smoothed. Through,the reconstruction of multiple facial?skull models, the?results shows that the mesh model generated by this algorithm has high quality ,the?algorithm?can?solve?the?problem?of?complex spatial?surface?reconstruction,?can?better?describe?the surface?shape?represented?by?point?cloud?data,?and?can provide a good basic mathematical model for the follow-up study of human facial and skull repair.