To　understand　the　impact　of　the　locking　dowels　on　the　longitudinal　seismic　performance　of　continuous　girder　bridge　with　different　pier　height,　the　main　bridge　of　the　Yuanjiang　River　Bridge　[a　prestressed　concrete　continuous　girder　bridge　with　span　arrangement　(62.5+5×96+62.5)　m]　on　Shimen-Changsha　Double-Track　Railway　was　taken　as　an　example　and　with　reference　to　the　working　principles　of　the　dowels,　the　ANSYS　was　used　to　set　up　the　finite　element　model　for　the　whole　bridge　of　the　bridge　with　different　pier　height,　the　seismic　mitigation　performance　of　the　dowels　and　the　impact　of　the　parameters　of　the　dowels　on　the　seismic　mitigation　effect　were　analyzed.　The　results　of　the　analysis　show　that　the　locking　dowels　arranged　on　the　sliding　piers　can　significantly　improve　the　global　seismic　performance　of　the　continuous　girder　bridge　and　the　proper　increase　of　the　internal　force　responses　of　the　sliding　piers　can　effectively　decrease　the　internal　forces　of　the　fixed　piers　and　girder　end　displacement.　The　seismic　mitigation　effect　of　the　dowels　gradually　decreases　with　the　increase　of　the　acceleration　activating　thresholds.　At　the　time　the　acceleration　activating　thresholds　and　locking　clearances　change,　the　lower　the　sliding　piers　are,　the　more　significant　the　seismic　response　changing　of　the　piers　will　be.　It　is　therefore　proposed　that　attention　should　be　paid　to　the　protection　of　the　low　piers　as　the　locking　dowels　are　used　for　the　seismic　mitigation　of　the　continuous　girder　bridges　with　different　pier　height.　©,　2015,　Wuhan　Bridge　Research　Institute.　All　right　reserved.