A structural model of three layers angle interlock woven composites, was built by mapping software Pro/Engineer. The distribution of stress & strain on fibers, resin and 3D composites, was simulated and discussed, under shear loading using finite element software ANSYS Workbench. And the failure mode of composites was analyzed. The results show that, uniform shear deformation on the shear direction occur in the composites. The main loads were supported by reinforced fibers and the minor loads were supported by matrix resin. Compared warp yarns to weft yarns, warp yarns axial direction parallel to shear direction show larger stress and strain than those axial direction perpendicular to shear direction.