To　achieve　sustainable　transportation,　ammonia　(NH3)　and　hydrogen　(H2)　should　be　applied　in　internal　combustion　engines.　The　adoption　of　turbulent　jet　ignition　(TJI)　can　improve　ignition　and　combustion　stability.　The　present　study　aims　to　explore　the　combustion　characteristics　of　NH3/H2/air　adopting　TJI,　and　the　effect　of　nitrogen　(N2)　dilution　on　factors　such　as　ignition　mechanism　and　flame　propagation　process　was　analyzed.　The　results　indicate　that　N2　dilution　worsens　the　combustion　of　NH3/H2/air.　When　the　H2　volume　fraction　is　50%,　a　dilution　ratio　of　30%　can　increase　the　ignition　delay　and　combustion　duration　by　3-6　times.　With　the　increase　of　the　dilution　ratio,　sensitivities　of　ignition　delay　and　combustion　duration　to　dilution　ratio　are　enhanced　in　both　passive　TJI　and　active　TJI　modes.　Compared　to　passive　TJI,　the　injection　of　auxiliary　gas　in　active　TJI　mode　reduces　the　sensitivity　of　jet　velocity　to　dilution,　which　can　accelerate　the　early　stage　of　flame　development.　However,　the　high　turbulence　intensity　provided　by　active　TJI　makes　the　ignition　position　closer　to　the　bottom　and　causes　an　extended　final　stage　of　combustion.　For　ultra-low　reactivity　mixtures,　the　active　TJI　with　the　scavenging　system　can　provide　sufficient　ignition　energy,　but　ignition　occurs　after　prolonged　accumulation　of　heat　and　radicals,　as　well　as　dissipation　of　turbulence.