The　shaking　table　test　of　a　half-cycle　negative　stiffness　friction　damping　device　with　negative　stiffness　characteristics　is　carried　out.　Taking　a　four-floor　steel　structure　frame　as　the　seismic　reduction　research　object，the　half-cycle　negative　stiffness　friction　damping　devices　were　arranged　on　the　first　and　second　floors　of　the　steel　structure　frame　respectively，and　the　seismic　response　of　the　structure　under　different　ground　motions　was　analyzed.　The　results　show　that　the　half-cycle　negative　stiffness　friction　damping　device　can　control　the　acceleration　and　displacement　response　of　the　structure，and　better　seismic　reduction　effect　can　be　obtained　if　it　is　arranged　on　the　position　with　large　structural　deformation.　©　2024　Nanjing　University　of　Aeronautics　an　Astronautics.　All　rights　reserved.