A numerical investigation is presented in this study to describe the effect of inclined stirrups on the shear behavior for reinforced concrete deep beams. This study was exceeded by two steps as a part of verification and parametric study. In the first step, three beams were analyzed with different arrangements of their stirrups. Two beams are reinforced with vertical and inclined stirrups when there are no stirrups in the third beam. The numerically load-deflection curves, cracking patterns, and load-maximum crack opening curves were presented for all analyzed beams. These numerical results were verified by the experimental study of Teng, Ma [1] showing an excellent agreement between them. In second step, another 16 beams within 4 groups were analyzed to show the parametric influence of using inclined stirrups. This parametric study presented the effect of main reinforcement ratio, shear span-to-depth ratio, space between stirrups, and bar cross-sectional are of stirrups on the deep beams reinforced with vertical and inclined stirrups. The deep beam reinforced with inclined stirrups leads to a significant increasing in the shear strength due to the contribution of these stirrups to restrict the opening of diagonal shear crack.