Abstract: The generation process of residual stress during the curing process of X-cor sandwich was described,and the analytical results indicate that carbon fiber Z-pins are subject to residual tensile stress.In consideration of the effects of residual stress,Z-pins were treated as beams upon an elastic foundation,then a sort of compressive strength computational modified model of X-cor sandwich was proposed and its compressive strength was computed.The X-cor sandwich samples of different density,diameter and angle of Z-pins were made for compressive strength experiments.Through contrast between experimental and computational results the computational model was verified.The residual stress increases as the Z-pin's diameter and density become bigger,or decreases as the Z-pin's angle increases.