Using of ultra-high-performance-fiber reinforced concrete (UHPFRC) in structural applications has significantly increased owing to its numerous advantages compared with conventional concrete such as normal concrete (NC) and high-performance concrete (HPC). UHPFRC exhibits superior properties in terms of compressive behaviors, tensile behaviors, and durability. this paper investigate the effect of steel fiber (volume fraction and aspect ratio) on the mechanical properties of ultra-high performance concrete such as, Compressive strength, modulus of elasticity, Poisson’s ratio, flexural strength and tensile strength. It is observed that mechanical properties are on higher side for 3% steel fibers volume fraction as compared to that produced from 0%, 1% and 2% fibers volume fraction.