The　conventional　technology　of　energy　dissipation　and　shock　absorption　requires　the　layout　of　shock　absorption　devices　installed　on　multiple　floors　to　effectively　reduce　the　seismic　response　of　a　structure,　which　occupies　more　structural　space.　Thus,　a　negative　stiffness　device　was　proposed　to　be　arranged　on　the　lower　floor　of　the　structure　which　formed　a　mechanically　isolated　layer　to　reduce　the　quantity　of　dampers　and　achieved　the　similar　isolation　effect　by　virtue　of　proper　friction　damping　components.　A　kind　of　negative　stiffness　friction　damping　device　was　designed　and　developed.　It　has　the　advantages　of　large　stroke　and　stable　mechanical　properties.　The　performance　test　verifies　that　the　negative　stiffness　friction　damping　device　can　realize　the　hysteretic　model　with　negative　stiffness.　The　simulation　analysis　of　the　damping　scheme　shows　that　if　only　the　device　is　placed　on　the　bottom　floor,　the　negative　stiffness　damping　device　can　obtain　an　ideal　damping　effect.　©　2021,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.