The　near-fault　ground　motion　is　featured　by　velocity　pulse　of　long　period,　short　duration　and　high　energy,　which　may　result　in　the　excessive　deformation　of　the　isolation　layer.　Its　adverse　influence　on　the　seismic-reduction　performance　of　the　long-period　isolated　single-tower　structures　with　a　large　chassis　should　be　revealed　and　validated　by　shaking　table　tests.　To　this　end,　the　characteristics　of　long-period　near-fault　ground　motion　were　firstly　discussed.　Then,　by　considering　the　horizontal　scale　size　of　1:3,　a　single-tower　steel　frame　model　with　a　large　chassis　was　designed　to　form　three　test　models:　mid-story　isolated　structure,　base-isolated　structure　and　seismic　structure.　One-dimensional　shaking　table　tests　were　carried　out　adopting　near-fault　and　far-field　ground　motions　as　its　external　excitation　input.　Furthermore,　the　impacts　of　long-period　velocity　pulses　of　near-fault　ground　motions　on　shock　absorption　performance,　including　the　story　drift,　acceleration　and　isolation　layer　deformation　of　these　test　models,　were　explored.　The　applicability　of　the　design　method　considering　near-field　influence　coefficients　for　isolated　structures　was　analyzed　and　validated.　The　results　show　that　the　dynamic　responses,　such　as　the　story　drift,　acceleration,　of　the　isolated　models　subjected　to　near-fault　pulse-like　ground　motions　are　1.5~2　times　as　large　as　those　subjected　to　far-field　ground　motions,　and　the　shock　absorption　efficiency　of　story　drift　and　acceleration　get　worse.　In　addition,　the　deformation　of　the　isolation　bearings　of　different-type　isolated　models　is　1.5　times　more　than　that　under　the　far-field　ground　motions.　Therefore,　the　negative　impacts　of　the　long-period　velocity　pulse　on　the　seismic　absorption　performance　of　the　isolated　structure　should　be　considered　in　the　design　of　isolation　structure　in　near-fault　area.　©　2018,　Nanjing　Univ.　of　Aeronautics　an　Astronautics.　All　right　reserved.