ABSTRACT　　The　invention　relates　to　a　device　for　testing　horizontal　displacement　of　dynamic　　characteristics　of　vibration　isolation　structure　which　comprises　a　reaction　wall,　　wherein　　the　reaction　wall　is　arranged　beside　the　vibration　isolation　structure;　　the　vibration　　isolation　structure　is　formed　by　a　building　with　a　vibration　isolation　layer;　　the　vibration　　isolation　layer　comprises　a　vibration　isolation　support,　　a　vibration　isolation　strut　and　a　　vibration　isolation　beam　plate　which　are　arranged　from　bottom　to　top;　　at　least　one　　ejector　rod　is　arranged　between　the　vibration　isolation　strut　and　the　reaction　wall;　　an　　installation　hole　for　placing　explosive　is　arranged　in　the　ejector　rod;　　and　the　invention　　also　relates　to　a　device　and　method　for　testing　horizontal　displacement　of　dynamic　　characteristics　of　vibration　isolation　structure.　According　to　the　invention,　　the　large　　displacement　transfer　value　of　the　structure　above　the　vibration　isolation　layer　in　the　　vibration　isolation　structure　is　realized,　　and　the　defect　that　the　obtained　structure　　dynamic　characteristic　accuracy　is　insufficient　due　to　the　fact　that　the　displacement　　transfer　value　is　too　small　when　the　vibration　isolation　structure　is　researched　by　using　　an　initial　displacement　method　in　the　prior　art　is　overcome;　　and　the　structure　above　the　　vibration　isolation　layer　in　the　vibration　isolation　structure　can　be　rapidly　reset　in　a　short　　time　by　greatly　improving　the　unloading　mode.　-1/9　203　3　　8　　202　　201　　7F　　Figure1I