This　paper　investigates　the　effectiveness　of　a　new　hybrid　passive　control　system　on　the　seismic　response　of　an　existing　steel　cable-stayed　bridge　considering　the　pounding　effect.　The　proposed　hybrid　passive　control　system　comprises　a　seismic　isolator　and　a　metallic　damper.　The　bridge　is　located　in　a　high　seismic　zone　and　has　suffered　several　damages　including　the　earthquake-induced　pounding　damage　during　the　1988　earthquake.　Thereby,　the　proposed　hybrid　passive　control　system　was　investigated　for　seismic　retrofitting　of　the　bridge　to　mitigate　the　seismic　damages　due　to　future　earthquakes.　The　hybrid　control　system　was　placed　at　the　bridge　ends　and　the　tower-deck　connection.　A　detailed　three-dimensional　finite　element　model　of　the　bridge　was　created　and　validated　with　the　earlier　experimental　results.　A　comparative　analysis　was　performed　through　a　series　of　nonlinear　dynamic　time-history　analyses　on　the　bridge　equipped　with　the　proposed　and　other　control　systems.　The　results　showed　that　the　hybrid　control　system　reduced　the　bridge＇s　longitudinal　seismic　displacement,　mitigated　the　pounding　of　the　bridge　with　abutments　and　improved　the　overall　seismic　performance　of　the　bridge.