按弹塑性体相似判据和破坏阶段相似判据确立相似常数，模拟山体形态、结构面和岩石物理力学性质、地应力、边界条件和埋设测点，建立三维模型，模拟开挖卸荷过程，监测边坡形态、地应力释放和山体应变，认识到边坡变形的主要因素、变形延时和变形量、变形与应力释放的关系及山体应力应变明显变化的范围． According to similarity criterion of elastic-plastic body and similarity criterion of failure stage, similar constants are established to simulate the shape, structural plane and physical and mechanical properties of mountain, geostress, boundary conditions and buried measuring points. Three-dimensional model is established to simulate the unloading process, The slope shape, the release of geostress and the mountain strain are monitored. The main factors of slope deformation, the relationship between deformation delay and deformation, deformation and stress release and the range of obvious change of mountain stress and strain are recognized.