Abstract: In this paper,mechanical model of FRP was analyzed.Acoustic emission (AE) technique and tensile test of latitudinal fiber for toughness matrix were studied.The results show that the major cause of permeability-seepage on corrosion resistant FRP is its lower breaking elongation rate.When loaded and stressed,the product can result in low matrix stress crack and gradually stretch.The crack was aggravated by the stress concentration of matrix region and was verified by the AE technique.The authors consider it necessary that the matrix elongation rate be among 3-6% in the laminated structure of FRP.