Abstract: Soil displacement is an important cause of stress fluctuation or invalidation of pre-stressed anchors. Using the load-displacement transfer function and based on the elastic theory, a force model of the pre-stressed anchor in saturated sand stratum is established, to study the variation law of stresses in the anchor in construc-tion processes and the mechanical characteristics of the anchor body with soil deformation for a real project. It is shown that the interface shear stiffness, the inclination angle and the anchor body diameter all have significant influences on the axial force in the anchor body and the interface shear stress.