Based on the half-baked skull of the victim

it is most important for criminal reconnaissance to reconstruct the victim's 3D appearance.In order to reconstruct 3D appearance truly

a new method of calculating parenchyma thickness is put forward in this paper.It is mainly based on convhull method with spire CT.We can establish a statistical neutral parenchyma thickness database by nation

age phase and so on.At last

we bring forward a proposal of the 3D facial reconstruction relying on subarea and convhull.Testing by the correlative department and the analysis of the reconstructing effect

it is proved to be effective and feasible

and we have acquired the anticipative effect.This method is more objective and faster than the other existing methods.