The aim of this research is to investigate the flexural behavior of Reinforced concrete beams with Phoenix Fibers of various percentages. Mechanical properties such as compressive strength, tensile strength, flexural behavior of reinforced concrete beams by using Phoenix fibers has been evaluated in this investigation. This research also includes load carrying capacity of the beams, crack pattern, Energy absorption and Stiffness of the beam. Locally available materials are used for this investigation.M20 grade of concrete has been designed for this investigation. Mechanical strength tests on standard specimens such as compressive strength, split tensile strength tests were conducted on phoenix fibrous concrete specimens.