The　large　deformation　of　a　base　isolation　layer　could　be　induced　by　near-fault　ground　motions.　Although　the　displacement-constraint　devices　can　constrain　the　large　displacements　of　the　base　isolation　layer,　impacts　between　the　displacement-constraint　devices　and　the　superstructures　of　the　base　isolation　layer　may　change　the　dynamic　responses　of　the　superstructures.　9　sets　of　test　data　about　base-isolated　structures　impacting　on　spring　displacement-constraint　devices　were　analyzed.　The　results　indicate　that　the　displacement-constraint　devices　can　constrain　the　displacement　of　the　base　isolation　layer　well,　but　higher　modes　will　be　exicited　and　great　velocity　increments　may　be　produced　due　to　the　impact.　The　story　drifts　and　accelerations　of　superstructures　will　increase　in　the　case　of　impact.　The　responses　of　superstructures　may　be　reduced　when　the　stiffness　of　the　displacement-constraint　devices　and　the　gaps　between　the　devices　and　structures　are　designed　reasonably.　©　2017,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.