The　reinforced　concrete　main　building　structure　of　a　600　MW　thermal　power　plant　is　taken　as　the　background　project.　The　buckling　restrained　brace　(BRB)　is　used　as　the　energy　dissipation　element　to　optimize　the　seismic　design　of　the　original　frame　bent-brace　structure.　Through　time　history　analysis　of　the　original　structure　and　three　kinds　of　shock　absorption　structures,　their　seismic　performance　under　rare　earthquakes　is　compared.　The　results　show　that　the　BRB　can　effectively　control　the　displacement　response　at　the　weak　layer,　improve　the　internal　force　distribution　of　the　structure,　and　make　the　structure　meet　the　requirements　of　8　degree　fortification.　In　the　high　intensity　area,　the　reinforced　concrete　frame　bent-BRB　(RCFB-BRB)　structure　is　worth　popularizing.