Structural　vibration　control　technique　is　an　appropriate　and　acceptable　method　to　control　structural　vibration　condition　and　dissipate　structural　vibration　energy　during　severe　earthquakes　and　violent　winds.　Metallic　dampers　are　verified　to　be　stable　and　effective　for　passive　control　by　many　scholars　and　engineers.　Low-yield-point　(LYP)　steel　provides　a　promising　prospect　for　energy　dissipation　dampers　widely　applied　in　structural　engineering　practice.　Experimental　study　was　conducted　on　a　novel　rhombic　steel　plate　damper　in　former　research　and　numerical　simulation　of　the　hysteretic　behavior　of　rhombic　dampers　was　performed　in　this　study.　Mechanical　performance　and　implementation　of　the　novel　rhombic　steel　plate　damper　is　briefly　introduced　in　this　paper.　The　hysteretic　behavior　of　the　novel　rhombic　steel　plate　dampers　made　of　three　types　of　steel　was　investigated　by　testing　and　finite　element　method.　It　is　concluded　that　the　yield　strength　enhancement　of　the　rhombic　steel　damper　made　of　LYP　steel　is　substantial.　The　numerical　simulation　results　of　the　hysteretic　behavior　of　the　rhombic　steel　plate　damper　are　similar　to　the　experimental　results　for　these　three　types　of　steel.　The　energy　dissipation　capability　of　rhombic　LYP　steel　dampers　is　excellent　and　adequate　to　be　used　in　passive　control　strategy　for　civil　engineering　structures.