Construction　and　control　principle　of　the　new　combined　steel　lead　damper　(NCSLD)　were　introduced,　pseudo-static　tests　of　NCSLD　which　would　be　used　in　the　subsequent　shaking　table　tests　were　carried　out　for　the　study　of　its　mechanical　properties　using　electro-hydraulic　servo　press-shear　machine.　Structural　seismic　design　procedure　using　NCSLD　is　presented.　An　engineering　example　of　seismic　strengthening　using　NCSLD　is　provided.　Results　of　tests　and　analyses　indicate　that　NCSLD　has　full　hysteresis　loops　which　take　on　bilinearity;　NCSLD　is　of　strong　energy　dissipation　ability　and　has　obvious　control　effects　for　structural　inter-story　displacement　and　acceleration　reactions.