大学物理专业的固体物理教学，通常以立方晶格为例，以静态图像的形式来说明s 态电子等能面的空间分布特点，而缺乏等能面随波矢k 变化的具体过程.本文采用Matlab 程序具体展示了紧束缚近似下立方晶格s 态电子等能面随着波矢k的变化，并给出了等能面的剖面图、叠加图、立体图和扩展图.结果表明: 当波矢k 从布里渊区中心向边界变动时，等能面会从“球面”向“类球面”变化，直至发生破缺，集中在布里渊区顶角附近.这些图像生动地展示等能面的变化，有效地辅助了教师的课堂教学以及加深了学生的理解.

Cubic lattice is a common crystal structure. In the teaching of solid-state physics in university，the cubic lattice is usually taken as an example to illustrate the spatial distribution characteristics of isoenergetic surface in the form of static images. However，it is lack of the detail changing of isoenergetic surface with the wave vector k. In this paper，the variation of isoenergetic surface of the s-state electron in cubic lattices with the wave vector k under the tight binding approximation is shown in detail by using the MATLAB program. The superposition，crosssection and extension graphs of the isoenergetic surface are also given visually. These images show that when the wave vector k changes from the center of Brillouin zone to the boundary，the isoenergetic surface changes from a sphere to a spherical-like surface until it breaks and concentrates near the corner of Brillouin zone. These results vividly show the changing of isoenergetic surface and it effectively assists teachers' teaching and deepens students' understanding of solid-state physics.