Abstract: The research of flow's penetration through complex geometry especially in three-dimension is always one of the important and difficult problems in partial differential equation (PDE). A method on the grid discretization of a several layers geometry was given. Particularly the detailed analysis of the topological geometry attribute on a fourteen surfaces structure-tetrakaidecahedron was fulfilled. In the process of putting the single elements together into a unity, we have used another technique that we treated one element as two inand out-parts, so that we could save the information of the grids efficiently, as well as get the simplification of the computation. At last, the discussion on the effects of the variable parameters on the geometry speciality of tetrakaidecahedron was accomplished.