Abstract: In this work,a fiber bundle geometry model was established on the basis of the distribution of fiber monofilament. The geometric model of fabric structure was also established by observing the cross section and orientation of the inner impregnated fiber bundle within 2.5D shallow-crossing bending fabrics. For the convenience of analysis, some repeatable representative units were selected for the fiber bundle and fabric structure geometry models. The characteristic properties of material and the directions of each element were defined by using a custom program (UMAT), and the embedded periodic boundary conditions ensured the continuous stress and displacement at the boundary surface of the element. A damage analysis was conducted in the gradual progress based on an improved damage criterion and stiffness reduction model. The initial elastic modulus, final compressive strength and damage mechanism of the material were deeply understood through the experimental research and finite element analysis, and the warp compression was found to show no brittle failure.