Abstract: According to the Geological conditions of the slop and the method of shear strength, the physical parameters were analysised using three methods of analysis of scene test parameter, parameter statistical analysis of experiment and back analysis of shear strength parameter. By using of the statistical analysis of experiment, the trail results about physical and mechanical parameters of slope soil and the experienced value of mechanical parameter, the advised value of physical and mechanical parameters and the main value of parameters about sensitivity analysis of the slop. Based on the three methods, the value of important parameter-C, φ about shear strength were reliable.