The　combined　steel-lead　damper　(CSLD)　with　the　merits　of　a　simple　principle,　a　simple　production　process　and　an　economic　performance　can　take　the　advantages　of　steel　and　lead　so　as　to　absorb　energy　from　earthquakes.　The　optimization　design　of　I-section　combined　steel-lead　dampers　in　a　structure　control　system　is　studied.　A　civil　engineering　vibration　control　Benchmark　structure　simulation　model　is　established,　and　the　parameter　of　the　ratio　of　a　damper-yield　force　to　an　inter-story　yield-shear　force　is　introduced　to　analyze　vibration　reduction　effect.　The　calculated　results　show　that　the　system　has　the　best　effect　when　the　ratio　is　5%.　According　to　the　optimization　design　method,　the　structure　control　system　of　a　steel　frame　model　is　designed　and　conducted　in　a　shaking　table　test,　and　the　test　result　indicates　that　the　combined　steel-lead　damper　control　system　has　an　excellent　vibration　reduction　effect,　and　it　verifies　the　reasonability　of　the　optimization　method.