One of the most common structural retrofitting methods is the use of GFRP composite.These materials have good mechanical properties such as high strength and durability against applied forces and environmental factors.On the other hand, some of the resilient characteristics of these materials, such as the lack of tolerance of forces, are its disadvantages.GFRP composite consists of two parts of the matrix and resin, which changes the properties of each of these sections on the overall properties of GFRP. This research includes studies in both laboratory and numerical fields. In the field of this research, we tried first to investigate the effect of the type of resin in the mechanical properties of GFRP composite and then, using the PEEK additive, to modify the resin component in the glass composite and its effect on the mechanical properties of the glass composite. In the field of numerical studies using limited finite element software, the effect of the correction of composite specimen of GFRP reinforced reinforced concrete beam has been evaluated.