Abstract: Prestressed cable anchor technology has been widely used in many fields of geotechnical reinforcement engineering.However,the research on the reinforcement mechanism of prestressed anchorage is still at an exploratory stage.Based on the fast Lagrangian analysis method(FLAC-3D),the stress,deformation and failure mechanisms of the anchorage segment,free segment and anchor pier under the effect of the single or multi-cable anchor system have been analyzed through 3D numerical modeling and some influence factors of shear stress distribution along the anchorage segment have also been discussed.On that basis,some useful conclusions are drawn,which can provide a reference for the engineering design and theoretical study.These research results prove to be effective through engineering practice.