Sandwich　structures　are　widely　applied　in　the　field　of　marine　structure　lightweight　design　and　impact　protection　due　to　their　excellent　mechanical　properties.　In　this　paper,　the　dynamic　mechanical　behaviour　and　energy　absorption　characteristics　of　aluminium　honeycomb　sandwich　panels　(AHSPs)　under　repeated　impact　loadings　are　investigated.　A　three-dimensional　elastoplastic　finite　element　model　of　AHSP　under　repeated　impact　loadings　is　established　by　using　the　commercial　software　ABAQUS　Explicit.　The　accumulation　processes　of　plastic　deformation,　the　impact　force-displacement　curves　as　well　as　the　energy　absorption　performances　are　numerically　calculated.　Besides,　the　repeated　impact　experiments　of　AHSPs　were　conducted　by　using　the　drop-weight　impact　testing　machine　INSTRON　CEAST　9350.　Furthermore,　the　influences　of　geometrical　parameters　on　the　dynamic　behaviours　of　AHSPs　under　repeated　impact　loadings　are　further　performed.　Results　show　that　the　numerical　calculated　results　are　in　good　agreement　with　the　experimental　results.　With　the　increase　of　the　repeated　impact　numbers,　the　bending　deflections　of　both　top　and　bottom　face　sheets　of　AHPSs　accumulate　gradually,　the　compressive　deformations　of　the　honeycomb　cores　enlarge　gradually　and　finally　the　densification　phenomenon　appears.　The　deformation　mode　of　bottom　face　sheet　experiences　the　mode　transition　from　the　global　bending　deformation　model　to　the　coupling　deformation　mode　of　the　global　bending　deformations　and　the　local　indentations.　©　2020