When　the　story　heights　of　adjacent　buildings　are　unequal,　the　inter-floor　pounding　maybe　happen　during　earthquake.　Employing　substructures　in　pounding　area,　the　analytical　model　of　adjacent　structures　with　unequal　story　height　is　developed,　and　the　equations　of　motion　considering　pounding　are　derived.　Based　on　analytical　model,　the　inter-floor　pounding　responses　of　adjacent　buildings　with　unequal　story　height　are　investigated.　The　corresponding　parametrical　studies　are　conducted　and　influence　rules　are　concluded.　The　results　show　that　the　influences　of　inter-floor　pounding　in　adjacent　buildings　on　main　structures　are　smaller　than　those　of　floor　pounding.　But　the　damages　on　pounding　area　are　quite　large.　Moreover,　the　period　ratio　of　structures,　the　initial　gap　and　the　pounding　location　have　remarkable　influence　on　responses　of　inter-floor　pounding.　©　JVE　INTERNATIONAL　LTD.　JOURNAL　OF　VIBROENGINEERING　2014.