The　magnetorheological　damper　is　a　kind　of　intelligent　semi-active　vibration　damping　device　with　good　prospects,　but　the　current　magnetorheological　dampers　mostly　use　shear　valves　as　the　working　mode.　The　vibration　damping　effect　of　this　type　of　damper　is　poor　when　used　in　hydraulic　mechanical　legs,　press　leveling　and　other　areas　due　to　the　insufficient　output　force　caused　by　the　size　of　the　structure.　In　this　paper,　a　shear-extrusion　hybrid　mode　magnetorheological　damper　was　designed　to　solve　the　problem,　and　a　full-channel　magnetic　circuit　structure　was　used　to　replace　the　traditional　magnetic　circuit　structure　to　increase　the　maximum　output　and　dynamic　range.　This　research　carried　out　the　structure　design　and　principle　analysis　of　the　new　magnetorheological　damper,　established　the　mechanical　model,　simulated　the　magnetic　field,　and　made　optimization　on　the　structure.　The　superiority　of　the　new　magnetorheological　damper　was　proved　by　the　prototype　test.　The　above　tests　and　simulations　show　that　the　damping　force　of　the　new　magnetorheological　damper　can　be　up　to　1065N　in　the　shear　valve　type　and　4939N　in　the　squeeze　type.　Especially,　when　the　piston　coil　is　fed　with　reverse　current,　the　magnetic　induction　intensity　of　the　new　damper　in　the　piston　damping　channel　is　all　above　0.2T,　while　the　magnetic　induction　intensity　of　the　traditional　damper　only　nearly　40%　reaches　0.2T.　When　set　the　current　in　the　same　direction,　the　magnetic　induction　intensity　of　the　new　damper　more　than　80%　can　reaches　0.3T,　while　the　damping　channel　of　the　traditional　damper　only　nearly　40%　reach　0.3T.　Compared　with　the　traditional　magnetorheological　damper,　the　shear-extrusion　hybrid　mode　magnetorheological　damper　has　a　larger　output　value　and　a　higher　dynamic　adjustable　coefficient.　©　2021,　Editorial　Department,　Journal　of　South　China　University　of　Technology.　All　right　reserved.