The use of FRP sheets for maintaining strength and durability in utilization of concrete structures is highly considered by researchers and structural engineers. In this study also, Reinforced-Concrete (RC) beam with T-shaped cross-section is being reinforced by use of CFRP and GFRP plates under 4-points inflections in finite element method. In order to analyze the performance of polymer plates in reinforcement of the considered concrete beams, some sheets with 5-10 cm wide, under different formation patterns are joined to the concrete’s area. For this purpose, the angle between the lines of plates and longitudinal axis of beam is varying under four-degree graduations from 30-90. In addition to that, the role of these sheets on limiting the deformation of the beam in its U-shaped and full-wrapping condition has been studied as well.The results’ survey of numerical analysis illustrates that the use of the each of the formation patterns and angle deflection of plates make differences in the process of beam settlement. Nonetheless on the basis of the results of C50 grade concrete samples are the most effective ones in the reduction of concrete deformation, which is related to the time when Carbon fibers with 5 cm wide is used under 30 degrees angle with beam linear axis and traversal formation pattern.