The　purpose　of　paper　is　to　gain　a　better　understanding　of　the　impact　resistance　of　fiber　reinforced　concrete,　and　experiments　were　conducted　on　the　impact　resistance　properties　of　alkali-resistant　glass　fiber　of　high　zirconium　and　coarse　polypropylene　fiber　reinforced　concrete　slabs　with　different　volume　fraction　contents.　From　the　dynamic　point　of　view,　the　improvement　effects　of　fiber　type　and　fiber　volume　fraction　on　the　impact　resistance　of　concrete　slab　were　studied　through　the　failure　morphology　of　the　specimen,　the　acceleration　time　history　of　the　drop　hammer　and　the　reaction　time　history　curve　of　the　bearing　at　the　bottom,　combined　with　the　impact　damage　process　of　the　whole　specimen　recorded　by　the　high-speed　camera.　It　is　found　that　after　the　second　impact,　the　damage　degree　of　plain　concrete　and　fiber　reinforced　concrete　slab　is　different.　The　plain　concrete　slab　is　brittle　and　broken　into　four　blocks　in　the　diagonal　direction.　The　slab　of　coarse　polypropylene　fiber　reinforced　concrete　with　the　volume　fraction　of　0.75%,　has　the　slightest　damage　with　nine　main　cracks　at　the　bottom　of　the　slab,　without　large　area　concrete　caving,　and　the　deformation　of　the　slab　is　large.　The　slab　of　alkali-resistant　glass　fiber　of　high　zirconium　reinforced　concrete　with　the　volume　fraction　of　0.75%,　has　nine　main　cracks　at　the　bottom　of　the　slab,　the　maximum　crack　width　is　only　0.8,　cm,　and　the　emergence　of　a　round　concrete　caving　area　with　a　radius　of　about　8,　cm　at　the　bottom　of　slab　is　observed.　Through　the　time　history　of　acceleration,　it　can　be　seen　that　there　are　significant　differences　in　the　failure　process　of　the　slab　between　plain　concrete　and　fiber　reinforced　concrete　slab.　In　the　elastic　deformation　stage,　the　duration　of　the　impact　of　fiber　concrete　is　about　1,　ms　longer　than　that　of　plain　concrete.　In　the　stages　of　crack　propagation　and　concrete　collapse,　when　the　acceleration　decreases　to　about　1/3　of　the　peak,　the　plain　concrete　slab　shows　the　tendency　of　brittle　failure.　The　acceleration　time　history　curve　of　the　fiber　concrete　slab　shows　the　secondary　strengthening,　which　is　ductile　failure.　Fiber　significantly　improves　the　impact　toughness　of　the　sheet,　and　the　higher　the　fiber　volume　fraction,　the　more　pronounced　the　improvement　in　impact　resistance.　©　2018,　Editorial　Board　of　Journal　of　Tianjin　University(Science　and　Technology).　All　right　reserved.