Abstract: It is of great significance to clarify the complex physical characteristics of subalpine meadows with different depths of root and soil for mechanized grassland grassing. The subalpine meadow in Gaoben Mountain Area of Xundian, Yunnan was taken as the research object, and the shear strength of the subalpine meadow at different depths was determined by conducting direct shear tests. The shear strength characteristics of the Moore-Cullen model were used for fitting analysis. The results show that with the increase of the depth of the sub-alpine meadow, its shear strength gradually decreases. The shear strength of the root-soil complex with a depth of 0～10 cm is the highest, and the shear strength of the root-soil complex with a depth of 20～30cm is the smallest. The simulation effect of The Moor-Cullen model is relatively obvious. The internal friction angle φ is basically constant within a certain range, and the change of the c value of its cohesion force is relatively obvious, indicating that the impact of the internal friction angle on the shear strength is relatively small, and the impact of the cohesion force on it is more significant.The research results can provide a reference for the design of subalpine meadow vegetation drafting equipment.