Based　on　the　ideas　of　passive　energy　dissipation,　multi-failure　and　damage　reduction,　a　multi-level　control　mode　of　seismic　unseating　failure　for　concrete　girder　bridge　is　presented.　The　control　mode　respectively　provides　displacement　restriction　by　energy　dissipation-based　pier-girder　connection　mode　and　unseating　prevention　by　girder-girder　connection　mode　and　the　two　level　control　modes　can　be　automatically　transformed　according　to　the　preset　threshold　value　of　＇structural　fuse＇.　Firstly,　the　analysis　model　of　the　multi-level　control　mode　is　established　and　the　control　mechanism　is　investigated.　Furthermore,　the　nonlinear　seismic　responses　of　a　concrete　girder　bridge　equipped　with　multi-level　control　mode　are　analyzed　based　on　a　simplified　mechanical　model　to　examine　the　control　effectiveness.　Finally,　parametric　influence　laws　of　unseating　failure　control　effectiveness　are　researched.　It　is　found　the　multi-level　control　mode　can　achieve　unseating　failure　prevention　and　structure　safety　protection　effectively　for　girder　bridges　during　earthquakes.