详细讨论了广义塑性力学中屈服面和塑性势面的对应关系以及岩土材料的三类屈服面 (即体积屈服面与 q方向上及θσ 方向上的剪切屈服面 )的基本特征 ,尤其是提出了能考虑剪胀与剪缩的体积屈服面和应力Lode角θσ 方向的剪切屈服面。指出在广义塑性力学中不必采用硬化定律 ,就能得出塑性应变增量与应力增量的关系 ,给出了求弹塑性矩阵的方法 The corresponding relationship between yield surface and plastic potential in generalized plastic mechanics and the basic characteristics of three types of yield surface of geomaterials (ie, the yield surface in volume and the shear yield surface in θ direction and θσ direction) are discussed in detail. In particular, The shear yield surface in the θσ direction of the volume yield surface and stress Lode angle can be considered considering dilatancy and shear shrinkage. It is pointed out that the relationship between plastic strain increment and stress increment can be obtained without using the hardening law in generalized plasticity mechanics.