There　is　a　lack　of　detection　means　for　the　isolation　performance　of　the　buildings　built　by　passive　control　technology，so　it　is　of　great　significance　to　test　the　dynamic　characteristics　of　the　isolated　structures　on　the　spot.　A　4-story　base　isolation　kindergarten　was　tested　in　the　field，and　the　test　device，method　and　results　were　displayed.　The　results　were　compared　with　the　seismic　structure　model　under　the　same　conditions，and　the　dynamic　response　law　and　damping　effect　of　the　actual　isolation　structure　were　explored.　The　building　was　pushed　away　with　hydraulic　jack　to　produce　98　mm（corresponding　to　LNR500　shear　strain　102%）hori-zontal　initial　displacement　of　the　isolation　layer，and　concrete　jacking　rod　was　installed　to　support　the　building；The　concrete　rod　was　blasted　with　explosives　and　unloaded　instantly　to　make　the　building　vibrate　freely；The　dynamic　response　and　other　parameters　were　tested　and　analyzed.　The　results　show　that　under　the　condition　of　horizontal　initial　displacement，the　first-order　natural　vibration　period　of　the　isolated　structure　is　significantly　longer　than　that　of　the　seismic　structure，and　the　damping　ratio　increases；The　hysteretic　curve　of　the　isolation　layer　is　full；The　dynamic　response　control　effect　of　each　floor　is　obvious，but　the　acceleration　of　the　roof　floor　is　slightly　amplified　compared　with　that　of　the　bottom　floor；After　unloading，the　isolation　layer　instantly　resets，which　shows　that　the　isolation　layer　has　rapid　reset　performance.　©　2024　Nanjing　University　of　Aeronautics　an　Astronautics.　All　rights　reserved.