In　order　to　meet　the　demand　of　large　flow　and　fast　response　electro-hydraulic　control　system,　a　large　flow　and　fast　response　on/off　valve　driven　by　a　linear　motor　was　developed.　The　basic　principle　was　that,　integrating　the　linear　motor　drive　technology　with　the　pilot　valve　structure　closely,　the　pilot　valve　and　main　valve　spool　were　direct　driven　respectively　by　a　high　power　linear　motor.　Firstly,　a　model　was　established　with　AMESim　simulation　software　for　the　hydraulic　quick　opening　valve　to　optimize　the　key　structural　parameters　and　to　get　its　static　and　dynamic　characteristics.　Then　the　motion　plan　was　programmed　with　Matlab/Simulink　software　for　both　the　position　loop　and　the　speed　loop　of　the　linear　motor　to　control　the　movement　state　of　the　on/off　valve　pilot　spool　and　the　main　spool,　to　achieve　a　precise　digital　control　of　the　valve　opening　and　improve　the　control　accuracy　of　the　fast　response　and　large　flow　valve.　Finally,　a　prototype　of　the　on/off　valve　was　developed,　and　the　trajectory　test　of　linear　motor　was　carried　out.　The　results　show　that　the　linear　motor　possesses　a　better　following　performance　and　can　achieve　the　planned　motion　curve.　The　experiment　and　simulation　results　are　basically　consistent,　which　proves　that　the　characteristics　of　the　developed　hydraulic　valve　can　satisfy　the　need　of　large　flow　and　fast　response.　©　2019,　Editorial　Department　of　Transaction　of　Beijing　Institute　of　Technology.　All　right　reserved.