The　large　deformation　capacity　of　a　traditional　lead　shear　damper　is　insufficient,　and　undesirable　phenomena　such　as　low　damping　efficiency　and　poor　stability　may　occur.　Based　on　the　design　scheme　of　the　normal　lead　shear　damper　with　long　stroke　(LSD-LS),　the　construction　and　design　method　of　an　improved　plate　lead　shear　damper　with　long　stroke　(ILSD-LS)　was　proposed.　Based　on　the　ideal　rigid-plastic　constitutive　law　of　lead,　a　mechanical　model　of　the　ILSD-LS　was　established.　Compared　to　LSD-LS,　ILSD-LS　has　better　damping　force,　energy　dissipation　capacity　and　stability　according　to　the　results　of　simulation　and　experiments,　and　the　method　of　calculating　damping　force　is　more　reasonable　and　accurate.　The　nonlinear　time　history　analysis　of　a　typical　high-rise　structure　with　ILSD-LS　was　carried　out　by　considering　the　characteristics　of　ordinary　ground　motion　and　long　period　ground　motion.　Numerical　results　indicate　that　seismic　response　of　a　high-rise　structure　with　ILSD-LS　is　significantly　reduced　even　when　subjected　to　long　period　ground　motion.　©　2018,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.