To　describe　the　complex　failure　process　of　reinforced　concrete　(RC)　beams　subjected　to　impact　loading　accurately,　a　mesoscale　numerical　analysis　method　was　established　to　explore　the　anti-impact　performance　of　a　RC　beam　considering　concrete　heterogeneity,　strain　rate　effect　of　concrete　mesocomponents,　concrete　being　assumed　as　a　3-phase　composite　composed　of　aggregate　particles,　mortar　matrix　and　interfacial　transition　zones　(ITZs),　and　a　web　reinforcement　being　embedded　into　the　plain　concrete　beam.　Using　the　proposed　simulation　method,　effects　of　dropping　hammer　velocity　on　anti-impact　performance　of　a　RC　beam　were　investigated.　The　simulation　results　including　failure　modes,　impact　loading,　mid-span　deflection　and　support　reaction　were　compared　with　those　of　the　macro-scale　simulation　results　and　the　published　test　results.It　was　shown　that　the　simulation　results　agree　well　with　those　of　tests;　the　proposed　meso-scale　numerical　model　and　method　are　feasible　for　simulating　anti-impact　performance　of　RC　beams.　©　2018,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.