High-speed　on/off　valve　(HSV)　is　widely　used　in　aviation　hydraulic　systems　due　to　its　excellent　response　speed　and　load　resistance.　However,　at　high-frequency　operating　conditions,　frequent　power　switching　cycles　with　high　voltages　will　lead　to　coil　heating,　which　severely　limits　the　performance　of　HSV.　Reducing　the　temperature　rise　while　ensuring　fast　response　has　been　a　significant　challenge　in　this　field.　To　address　this　issue,　the　heat-separated　driving　circuit　(HSDC)　is　innovatively　applied　and　optimized　to　HSV.　By　introducing　an　external　resistor,　HSDC　not　only　reduces　the　temperature　rise　but　also　shortens　the　response　time.　To　optimize　the　electrical　parameters　of　HSDC,　a　multiphysics　field　model　is　established　using　the　finite　element　method,　and　a　multiobjective　optimization　is　carried　out.　The　Pareto　front　is　obtained　by　NSGA-II　algorithm　and　evaluated　by　EWM-TOPSIS　method.　Finally,　comparative　tests　are　conducted.　The　experimental　results　indicate　that　compared　with　the　conventional　coil　driving　circuit,　the　optimized　HSDC　can　significantly　improve　temperature　rise　characteristics,　reduce　the　maximum　temperature　rise　by　75.21%,　and　shorten　the　time　to　reach　the　steady-state　temperature　by　29.71%.　Moreover,　the　dynamic　performance　is　also　improved　with　a　4.90%　reduction　in　total　response　time　and　a　widening　of　the　duty　cycle　adjustable　range　at　low　frequencies.　These　results　validate　the　effectiveness　of　the　proposed　design　and　optimization　scheme,　demonstrating　significant　potential　in　reducing　temperature　rise　and　improving　dynamic　performance.