Abstract: According to the current situation that there are few research results about the mechanics regularity of prestressed anchor cable and lattice beam at the wall in tilted back, the tilted three-dimensional model of anchor cable and lattice beam at Beijing Mentougou are built using Midas/GTS.And the stress, bending moment, horizontal deformation and the variation of lateral earth pressure at the wall in tilted back which is upright or tilted with 80 and 70 are analyzed. The results shows that the axial force of anchor rope, bending moment and horizontal deformation are the largest in the section with the angle of 70, while those are the smallest in the vertical section. So we suggest that the upright section should be chosen for the prestressed anchor cable and lattice beam.