In this paper, the distribution and variation of resin pressure were tested by a specially designed measuring system, reflecting the resin flow during the process. Based on this system, the effects of the applied pressure, the lay-up of laminate and the variety of bleeder on resin pressure were investigated. It indicated that the transfer of resin pressure along the laminate thickness direction was not instantaneous. The resin pressure of the laminate boundaries and the resin flow behavior both were influenced by the studied factors. These results are valuable for the modification of the resin flow model and the precise determination of the boundary conditions.