Abstract: According to the actual background of penetration of reinforced ultra-high performance-concrete (UHPC) by drilling weapons, studied by numerical simulation method is the influence of reinforcement on the penetration resistance of ultra-high-performance concrete (UHPC). The reliability of the numerical model and material parameters is verified by the test data of UHPC target of projectile penetration element. Through dimensional analysis, it is determined that steel bar diameter d, steel bar plane spacing s_h and layer spacing s_v are the main factors affecting the reinforcement. The penetration conditions of UHPC targets with different bar spacing and diameters of 300 m/s and 600 m/s were calculated and analyzed, and the influence of different reinforcement forms on the penetration depth under the same reinforcement ratio was studied. The results show that reinforcement can effectively improve the penetration resistance of ultra-high-performance concrete. The penetration depth and surface pitting diameter are positively correlated with reinforcement spacing, but negatively correlated with reinforcement diameter. Under the same reinforcement ratio, the reinforcement with small spacing and small diameter can improve the penetration resistance of UHPC more effectively than the reinforcement with large spacing and large diameter.