Although　pure　hydrogen　engines　can　achieve　zero　carbon　and　extremely　low　NOx　emissions　under　ultra-lean　combustion　conditions,　there　are　limitations　with　combustion　stability　and　power　performance.　This　paper　combines　turbulent　jet　ignition　(TJI)　and　variable　valve　timing　(VVT)　technology,　which　not　only　improves　the　power　output　of　pure　hydrogen　engines　under　ultra-lean　combustion　conditions　but　also　ensures　the　engine＇s　stable　operation.　Therefore,　this　research　reveals　the　working　characteristics　of　TJI　engines　under　lean　conditions　through　numerical　methods　and　explores　the　optimization　characteristics　of　VVT　on　engine　power　performance　and　stability　through　experiments.　The　results　indicate　that　TJI　utilizes　strong　turbulence　and　multiple-point　ignition　to　improve　the　efficiency　of　the　mixture　and　combustion　speed,　ensuring　reliable　ignition　capability　under　ultra-lean　operating　and　achieving　a　stable　and　effective　combustion　process.　According　to　the　experimental　results,　the　combination　of　TJI　with　VVT　technology　can　ensure　engine　cyclic-variability　of　less　than　1.5　%　and　the　maximum　values　of　Brake　mean　effective　pressure　(BMEP)　and　Brake　thermal　efficiency　(BTE)　are　4.5　bar　and　41.6　%,　respectively.　This　innovative　technology　combination　not　only　enables　the　efficient　and　ecofriendly　development　of　the　transportation　industry　but　also　holds　significant　importance　for　promoting　carbon-free　fuels　and　environmental　protection　in　the　future.