Abstract: In order to study the mechanical properties of hybrid fiber reinforced concrete, 9 different groups of concrete specimens with ultra-fine steel fiber (UFSF) and polypropylene fiber (PPF) were tested according to the compressive strength and splitting tensile strength test, and the influence of the volume fraction of UFSF and PPF were analyzed. The results indicate that compressive strength, splitting tensile strength and tension-compression ratio were increased after adding a reasonable volume of hybrid fiber. Hybrid fiber concrete has noticeable ductile characteristics. The volume fraction of UFSF was proved to have the biggest influence on the mechanical properties of concrete. The mechanical properties of the hybrid fiber reinforced concrete were enhanced effectively with the increase of UFSF. The mechanical properties of concrete were not enhanced linearly with the volume fraction of PPF. Hybrid fiber concrete with 0.1% dosage of PPF and 1.5% dosage of UFSF achieved the best mechanical properties. Besides, the compressive and strength was increased by 19.42%, splitting strength was increased by 56.78%, and tension-compression ratio was increased by 30.16%.