In　order　to　define　the　installation　method　of　locking　dowel　for　long　span　and　long　unit　continuous　beams　bridges,　the　dynamic　finite　element　model　was　built　using　the　ANSYS　with　a　railway　bridge　as　the　practical　engineering　example,　which　has　a　main　bridge　of　(62.5+5×96+62.5)m.　The　four　seismic　wave　were　taken　as　excited　wave　and　the　non-linear　dynamic　time-history　analysis　was　conducted,　then　the　seismic　response　of　continuous　beams　bridges　with　the　different　locking　dowel　amount　were　compared　and　illustrated.　The　amount　range　of　locking　dowel　was　developed　based　on　the　analysis　results　and　the　amount　range　was　verified　in　continuous　beams　bridges　with　different　height　and　different　span.　Finally,　the　optimal　installation　placement　was　studied　base　on　the　simulation　analysis　results.　The　results　show　that　the　locking　dowel　can　significantly　improve　the　seismic　performance　of　long　span　and　long　unit　continuous　beams　bridges,　and　the　installation　number　of　locking　dowel　can　be　selected　in　a　wider　range.　When　the　number　of　locking　dowel　is　less　than　the　number　of　pier,　the　locking　dowel　is　designed　to　be　installed　on　the　pier　on　both　sides　of　fixed-pier　and　adjacent　side　pier　can　obtain　the　optimal　damping　effect.　©　2016,　Editorial　Board　of　Journal　of　Huazhong　University　of　Science　and　Technology.　All　right　reserved.