Plant biomechanical characteristics are an important part of the research on soil and water conservation measures, and provide an important theoretical basis for soil fixation, water retention, water retention, flow resistance and sand retention.In this paper, 8a declining sea buckthorn plantation in the Wushan Sandstone area of Inner Mongolia was taken as the research object. After one growing season, the characteristics of root distribution and the shear resistance of the root-soil complex were studied by adopting the measures of crop restoration, and the differences were compared with ck under the same site conditions. It can provide the scientific basis of biomechanics for sustainable management of sea-buckthorn artificial forest with soil stabilization, slope protection and soil conservation. The results showed that the root number, root length, root surface area and root dry weight of 0-1.5mm diameter of standard seabuckthorn roots were 87.13% > 77.84% of uncultivated roots, respectively. The root length was 87.16% in plain stubble and 87.13% in open stubble.The root surface area of flat stubble was 52.57% and that of unflat stubble was 44.22%.The root dry weight of flat stub was 54.78% higher than that of unflat stub 46.18%, indicating that flat stub promoted fine root growth. The shear strength and residual shear strength of the root soil complex increased by 4.08% and 28.80%, and the cohesion and residual cohesion increased by 8.25% and 50.64%, respectively, in the plain soil compared with the non-plain soil, and the internal friction Angle and residual internal friction Angle increased by 18% and 25.57%, respectively. The shear and residual shear properties of the stubble and unstubbed sea buckthorn root soil complex were better than those of plain soil, that is, the shear ability of soil with roots was better than that of soil without roots. The experimental results showed that stubble promoted the growth of fine roots, the vigorous life activities of fine roots strengthened the root-soil interaction, improved the root soil bonding performance, and improved the shear strength of the root-soil complex after stubble through the network cementation and winding of fine roots, which promoted the stability and erosion resistance of the soil.