To　optimize　the　damping　effect　of　the　viscous　dampers　used　for　double-pylon　cable-stayed　bridge,　the　Huai＇an　Bridge　(a　double-pylon　cable-stayed　bridge　with　a　main　span　of　416　m)　was　cited　as　an　example　for　study.　The　software　SAP2000　was　used　to　establish　the　three-dimensional　finite　element　model　for　the　whole　bridge　of　the　bridge　and　the　damping　effect　of　4　different　layout　schemes　of　the　viscous　dampers　(the　dampers　were　to　be　respectively　laid　out　at　the　locations　of　the　pylon　bearings,　abutment,　side　pier　plus　abutment　and　side　pier)　was　comparatively　analyzed　by　the　nonlinear　dynamic　time-history　method.　The　optimal　layout　scheme　was　chosen　and　the　parameters　of　the　viscous　dampers　were　analyzed.　By　the　least　square　regression　analysis　method,　the　mathematical　model　for　the　parameters　of　the　critical　sections　and　the　dampers　was　created　and　on　the　principle　of　controlling　the　internal　forces　and　deformation　of　the　sections　to　the　minimum,　the　optimal　design　parameters　were　obtained　through　solving　the　extreme　values　of　the　fitting　equations.　The　results　of　the　study　show　that　the　scheme　of　installing　the　viscous　dampers　at　the　abutment　of　the　bridge　can　result　in　better　damping　function　of　the　dampers　and　will　not　change　the　stress　of　the　auxiliary　piers.　The　proposed　optimal　design　method　for　the　parameters　of　the　dampers　can　be　used　to　effectively　calculate　the　optimal　parameters　of　the　dampers　and　will　hence　provide　convenience　for　the　design.　©,　2014,　Bridge　Construction.　All　right　reserved.