High-speed　on/off　valve　(HSV)　generates　noise　and　vibration　due　to　high-frequency　collisions　between　internal　components　and　fluid　pressure　impacts.　In　order　to　reveal　the　principle　and　characteristics　of　HSV　noise　generation,　this　study　establishes　the　transient　acoustic　field　model　of　HSV　in　motion　by　considering　the　coupling　effects　of　electromagnetic　force,　fluid　force,　and　spring　force.　First,　the　characteristics　of　HSV　excitation　force　with　spool　displacement　are　analyzed.　Second,　the　vibration　characteristics　of　the　valve　under　the　excitation　force　are　analyzed,　and　the　most　intense　part　of　the　vibration　is　identified.　Finally,　the　sound　field　of　the　HSV　is　modeled　using　the　vibration　response　as　a　boundary　condition,　and　the　transient　characteristics　of　the　noise　are　analyzed.　This　characteristic　can　provide　an　indirect　measure　of　the　spool　displacement.　The　experimental　results　show　that　the　difference　between　simulation　and　experiment　is　less　than　3%.