With the aid of computer,a new method of drawing the isoenergic surface of square lattice is now improved.And its application to drawing the isoenergic surface of cubic lattice is also introduced.

• 以二维正方晶格为例，具体说明如何利用计算机来描绘二维正方格子和三维立方格子在第一布里渊区内电子的等能线或等能面.