Fiber reinforced concrete is the mixture of concrete and steel fiber, which has advantages such as increasing the ductility of concrete structure, sealing cracks, enhancing wear resistance, and improving the mechanical properties of the material after the cracking stage. The paper presents an experimental study of steel fiber percentage affecting on the flexural behavior of reinforced concrete (RC) beam using fiber reinforced concrete. 02 groups of RC beam samples (each one has 02 beams) have identical crosssections and the strength of concrete, manufactured with the steel fiber percentage of 0.4% and 0.6% by volume, respectively, and tested in four-point bending. The obtained result of the experiment allows clarifying the flexural behavior of RC beam using fiber reinforced concrete and the vital role of steel fiber percentage in dispersing flexural cracks, limiting crack expansion, and enhancing the post-cracking beam stiffness.