Hydrogen　is　a　renewable　fuel　with　excellent　combustion　characteristics.　However,　the　direct　use　of　hydrogen　in　existing　engines　faces　obstacles　such　as　abnormal　combustion　and　high　NOx　emissions.　This　study　proposes　a　strategy　for　controlling　the　combustion　and　emissions　performance　of　a　port-injection　(PI)　hydrogen　internal　combustion　engine　using　ethanol　direct　injection　(DI).　The　test　conditions　are　1000　rpm,　1500　rpm,　and　2000　rpm　respectively,　the　excess　air　coefficient　is　1,　1.5,　and　2,　and　3%,　6%,　and　9%　ethanol　is　added.　The　results　showed　that　the　addition　of　ethanol　can　significantly　reduce　the　pressure　rise　rate　of　the　hydrogen　engine　and　prolong　CA0-10　and　CA10-90.　The　addition　of　ethanol　can　promote　the　BMEP　and　BTE　of　the　hydrogen　engine.　The　addition　of　ethanol　can　reduce　NOx　emissions　under　lean　burn　conditions　by　18%.　The　disadvantage　is　that　the　addition　of　ethanol　increases　the　hydrocarbon　emissions　of　hydrogen　engines　by　about　50%,　but　the　total　amount　is　less.　After　the　addition　of　ethanol,　the　flashback　phenomenon　of　the　hydrogen　engine　was　significantly　improved.(c)　2023　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.