Mapping software Pro/E 5.0 was used to build structure models of 3D angle-interlock composite in warp and weft directions. Finite element analysis software ANSYS was used to simulate the lateral compressive properties of the 3D composite in warp and weft directions. The mechanical behavior of the composite was predicted by investigating the stress and strain distribution of fiber and resin under lateral compressive loads.In addition,the lateral compressive property between warp and weft directions was compared with each other. Results showed that the lateral compressive property of the 3D composite is obviously anisotropic, behaving as the lateral compressive property in weft direction better than that in warp direction.Fiber made the major contribution for subjecting the load,while the resin made the major contribution for deformation.Fibers parallel to the lateral direction are subjected to larger load,while fibers perpendicular to the lateral direction are subjected to smaller load.