本文在Mohr——Coulumb准则及Drucker——Prager准则基础上,提出了一个在π平面上不存在角点、公式简单、保证屈服面外凸,且由三轴试验结果表明能比Drucker——Prager准则更符合于实际的改进的岩体屈服准则,应用该准则进行三维非线性有限元计算既比Mohr——Coulumb准则方便,又可比Drucker——Prager准则具有更好的精度 Based on the Mohr-Coulumb criterion and the Drucker-Prager criterion, this paper proposes that there is no corner point on the π plane, the formula is simple, and the yield surface convexity is guaranteed, and the triaxial test results show that it can be compared with Drucker-Prager. The criterion is more in line with the actual improved rock mass yield criterion. Applying this criterion for three-dimensional non-linear finite element calculations is both easier than the Mohr-Coulumb criterion and better than the Drucker-Prager criterion.