A simple apparatus was designed and constructed so that flow would be one-directional and capable of measuring the unsteady-state permeability and the capillary pressure of carbon fiber-epoxy resin system. And the resin flow characteristics were analyzed as a function of the number of woven fabric plies. The experiments was performed for the flow visualization and measurements of flow front and mold filling time. The numerical simulation of the mold filling process was carried out based on the finite element/control volume method. The permeability of a fibrous preform increased rapidly with the porosity, and changed by resin flow direction and alignment of woven fabric. The capillary pressure induced by the surface tension of epoxy resin increased rapidly with the decrease of the porosity. The capillary pressure and permeability of fibrous preform increased with the number of woven fabric plies at the same porosity. The flow front and filling time predicted by numerical simulation taking into account of the capillary pressure were in good agreement with those observed experimentally during impregnation process. The present study carried out by both experiments and numerical analysis has verified the fact that the capillary pressure is required to obtain more accurate predictions of the flow front and filling time in resin flow modeling.