使用现代李群的分析方法，讨论传统计算流体力学中的有限差分格式高阶项效应所对应的群结构、群分类，以及对应的群不变解问题.有助于从对称性角度理解传统计算流体力学中有限差分格式的离散差分效应.

This paper presents an analysis on the group structure of finite difference scheme in computational fluid dynamics using the Lie group analysis method, together with the invariant solutions of the traditional schemes. The study will help understand the differential effects of discreteness on numerical dissipation and dispersion.