Under　the　action　of　meizoseismal　forces,　a　base-isolated　building　is　possible　to　pound　adjacent　buildings　because　the　horizontal　displacement　of　bearings　is　too　large.　A　nonlinear　Hertz-damp　impact　model　with　contact　element　approach　in　the　form　of　spring　and　dashpot　was　used　to　model　the　adjacent　buildings.　The　equations　of　motion　for　the　structural　pounding　system　were　set　up　and　the　influences　of　the　impact　on　the　isolated　structure　and　the　non-isolated　structure　were　studied.　Then,　the　analyses　of　parameters　were　performed.　The　results　showed　that　the　pounding　on　the　base-isolated　structure　leads　its　every-floor　acceleration　to　have　an　obvious　magnification,　however,　the　vibration-isolating　device　can　still　protect　its　upper-structure.