Fiber-reinforced　polymer　(FRP)　bar　is　increasingly　employed,　due　to　their　advantages　in　higher　tensile　strength,　light　weight　and　corrosion　resistance　than　steel　bars.　A　numerical　model　was　created　and　verified　using　existing　testing　data　to　explore　the　impact　behavior　of　concrete　slabs　reinforced　with　Glass　FRP　(GFRP)　under　varied　impact　masses　and　velocities.　The　damage　process　was　determined　using　calibrated　model　that　depicted　the　failures　of　concrete　slabs　reinforced　with　GFRP　bars　when　subjected　to　impact　loading.　Moreover,　the　influence　of　the　impact　velocity　and　impact　mass　on　the　impact　behavior　of　the　slabs　was　systematically　examined.　It　is　found　that　the　characteristic　of　the　time　histories　of　central　displacement　and　impact　force　has　a　certain　functional　relationship　with　impact　velocity　or　impact　mass.　From　the　viewpoint　of　impact　energy,　the　maximum　central　displacement　grows　linearly　as　impact　energy　increases,　while　the　peak　impact　force　and　energy　satisfy　the　quadratic　function.　In　addition,　as　the　impact　velocity　or　mass　increases,　the　response　of　the　slabs　transforms　from　global　dominant　to　local　dominant.　Under　the　impact　loads,　the　concrete　dissipates　most　of　the　impact　energy.　Finally,　both　the　normalized　peak　and　residual　displacements　of　the　slabs　vary　in　a　practically　linear　form　concerning　the　change　of　their　natural　frequency.