The　structural　vibration　control　efficiency　of　traditional　toggle-brace-damper　systems　may　be　improved　by　increasing　the　deformation　of　the　damper.　However,　it　needs　to　occupy　a　large　space.　In　addition,　the　related　theoretical　formula　based　on　the　small　deformation　assumption　cannot　reflect　the　time-varying　characteristics　of　the　amplification　factor,　which　makes　it　difficult　to　realize　the　geometric　optimization　of　the　toggle-brace-damper　system.　Against　this　background,　a　local　toggle　energy　dissipation　device　equipped　with　viscous　dampers　was　proposed　in　this　paper.　Its　space　occupation　is　small,　and　its　arrangement　is　flexible.　Based　on　the　geometric　relationship,　the　analytical　solution　of　the　local　displacement　amplification　factor　was　derived.　The　parametric　analysis　was　carried　out　based　on　the　analytical　solution.　It　can　be　concluded　from　the　analysis　that　the　displacement　amplification　capacity　of　the　local　convex　toggle　energy　dissipation　device　increases　with　the　angle　between　the　lower　toggle　brace　and　the　horizontal　plane.　While　the　displacement　amplification　capacity　of　the　local　concave　toggle　energy　dissipation　device　decreases　with　the　angle　between　the　lower　toggle　brace　and　the　horizontal　plane.　For　the　local　convex　toggle　energy　dissipation　device,　the　optimal　value　of　the　ratio　of　the　span-to-height　lies　in　the　range　between　0.7　and　1.3.　For　the　local　concave　toggle　energy　dissipation　device,　this　optimal　value　is　about　0.7.　Subsequently,　the　calculation　method　of　the　inter-story　drift　amplification　factor　of　the　local　toggle　energy　dissipation　device　was　proposed　based　on　the　improved　D-value　method.　The　optimization　steps　for　the　inter-story　drift　amplification　factor　were　given　based　on　the　possible　maximum　lateral　drift　of　the　local　toggle　energy　dissipation　device　at　external　excitations.　A　case　study　was　carried　out　to　verify　the　feasibility　of　the　local　toggle　energy　dissipation　device　and　the　effectiveness　of　the　optimization　method.　The　results　indicate　that　the　displacement　amplification　capacity　and　the　vibration　control　effect　of　the　local　toggle　energy　dissipation　device　can　be　obviously　improved　by　the　optimization　method　proposed　in　this　paper.　©　2022,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.