Abstract:Through the analysis of loading characteristics and with the consideration of loading mechanism of smaller shear displacement with better loading properties of prestressed anchor bar,the analytical method of shear displacement was discussed. By using a practical engineering case of unstable retaining wall,which is located in Tai¢an city,Shandong province,the practice bonding length of prestressed anchor bar was analyzed systemically with some in-situ pull-loading displacement data. Finally,the optimum bonding length of prestressed anchor bar under the 180 kN prestressed load was achieved.