Five proposed simply supported RC beams were numerically tested by finite element method using ABAQUS software to investigate their behavior and shear strength when strengthened by embedded through section technique (ETS). All beams have the same dimensions of (160 × 250 ×1140) mm and were insufficient reinforced in shear. One beam is taken as a control beam. While, the other four beams were strengthened ETS CFRP bars and divided into two groups. The first group is with 13mm ETS CFRP bars (one bar per section). While, the second group is with 10mm ETS CFRP bars (two bars per section). For all groups, two styles of ETS inclination are considered, vertical and inclined by 45°. From the numerical tests, it was found that using ETS with 2φ10 inclined CFRP bars is the most effective technique for enhancing both the first cracking load about 100% and ultimate load capacity about 86%.