Following the theory of underground structure design and Drucker-Prager standard for rock yield, the wall rock stability of a highway tunnel in Guangxi was analyzed by finite element method, taking self bearing capacity of wall rock into account. 根据地下结构设计理论和岩石屈服的Drucker-Prager准则,考虑到了围岩的自身承载能力,采用有限元的分析方法对广西柳州一处公路隧道围岩的稳定性进行了分析。