The　related　parameters　of　electronically　controlled　injector　have　profound　influence　on　the　fuel　injection　performance　of　injector.　However,　most　of　the　current　researches　focus　on　some　parameters　of　actuator,　but　few　on　some　parameters　of　nozzle.Based　on　the　direct-drive　giant　magnetostrictive　injector,　the　simulation　model　of　this　injector　was　built　with　AMEsim　simulation　software,　and　the　effects　of　nozzle　parameters　such　as　half　cone　angle　of　needle　valve,　diameter　of　needle　valve　stem　and　diameter　of　nozzle　hole　on　the　injection　performance　of　this　injector　were　studied.　In　view　of　the　many　research　parameters,　the　orthogonal　experiment　method　was　adopted　to　design　the　experimental　scheme　reasonably,　and　finally　L16(45)　orthogonal　experimental　table　was　selected　for　the　experiment.　The　results　show　that　the　parameters　that　have　the　greatest　and　smallest　influence　on　the　fuel　injection　performance　of　this　injector　are　the　cavity　parameters　and　the　number　of　injection　holes.　The　optimum　combination　of　nozzle　parameters　was　obtained,　and　the　fuel　injection　performance　of　injectors　before　and　after　the　optimization　of　nozzle　parameters　was　compared.　It　was　found　that　the　optimized　combination　of　nozzle　parameters　had　a　better　correspondence　between　fuel　injection　rate　and　needle　valve　displacement,　which　provided　the　possibility　for　further　improving　the　flexibility　of　fuel　injection　rate.　©　2023　SPIE.