With　incorporation　of　assembling　joints,　precast　concrete　beams　could　behave　very　differently　in　resisting　both　static　and　dynamic　loads　in　comparison　to　conventional　reinforced　concrete　beams.　With　no　research　available　on　the　dynamic　behavior　of　precast　concrete　beams　under　impact　load,　a　combined　experimental　and　numerical　study　is　conducted　to　investigate　the　dynamic　response　of　precast　concrete　beams　under　impact　load.　The　results　were　also　compared　with　reinforced　concrete　beams.　Four　groups　of　concrete　beams　were　tested　with　all　beams　designed　with　the　same　reinforcement,　but　different　assembling　locations　were　considered　for　precast　concrete　beams.　The　effects　of　the　assembling　location　in　resisting　drop　weight　impact　of　precast　concrete　beams　were　analyzed.　The　influence　of　impact　mass　and　impact　velocity　on　the　impact　resistance　of　precast　concrete　beams　were　also　investigated.　The　results　revealed　that　the　further　the　assembling　location　is　away　from　the　impact　location,　the　closer　the　mechanical　performance　of　the　precast　concrete　beam　is　to　that　of　the　reinforced　concrete　beam.　When　the　assembling　location　and　the　impact　location　coincided,　the　assembling　region　suffered　from　severe　local　damages.　With　increased　impact　velocity　and　impact　energy,　the　damage　mode　of　the　precast　concrete　beams　may　change　gradually　from　bending　failure　to　bending-shear　failure　and　eventually　to　local　failure.　In　addition,　the　bonding　around　the　assembling　interface　was　found　to　be　effective　to　resist　drop　weight　impact　load　regardless　of　the　magnitude　of　the　impact　velocity　and　energy.