The　impact　performance　of　ultra-high-performance　fiber-reinforced　concrete　(UHPFRC)　beams　under　impact　loading　is　studied　experimentally　and　numerically　in　this　research.　Ten　UHPFRC　beams　were　fabricated　for　the　test　to　examine　the　effects　of　impact　energy　and　reinforcement　configuration　on　the　cracking　patterns　and　dynamic　response　of　UHPFRC　beams.　According　to　the　test　results,　all　specimens　exhibited　flexural-brittle　failure.　The　characteristic　values　of　impulse,　impact　duration,　maximum　displacement,　residual　displacement,　and　absorbed　energy　all　increased　gradually　with　the　impact　energy.　The　longitudinal　reinforcement　ratio　decreased,　the　maximum　width　and　height　of　the　bending　main　crack　gradually　increased.　The　specimen　equipped　with　double-layer　tensile　longitudinal　bars　could　better　limit　the　development　of　cracks　in　the　specimen.　The　effect　of　stirrups　ratio　on　dynamic　response　of　UHPFRC　beams　was　limited.　Finite　element　software　ABAQUS　was　used　to　simulate　the　impact　test,　and　the　accuracy　of　the　simulation　was　verified　with　the　test　results.　The　effects　of　various　parameters　on　the　dynamic　responses　of　UHPFRC　beams　were　further　investigated　through　parametric　studies.　Genetic　algorithms　were　utilized　to　predict　the　parameter　values　of　UHPFRC　beams　under　the　most　unfavorable　impact　resistance　state.　These　findings　inform　structural　and　strengthening　design　for　UHPFRC　beams　under　impact　loading.　©　2025　Institution　of　Structural　Engineers