Adopting　ammonia　(NH3)　is　considered　a　viable　way　to　reduce　carbon　emissions.　The　combustion　of　NH3/air　can　be　enhanced　through　the　fuel　dissociation　strategy　and　the　use　of　turbulent　jet　ignition　(TJI).　This　study　investigated　the　combustion　of　partially　dissociated　NH3　ignited　by　active　TJI.　It　can　be　found　that　the　hydrogen　(H2)　pre-chamber　effectively　enhances　the　combustion　of　partially　dissociated　NH3,　and　the　appropriate　rich　prechamber　equivalence　ratio　is　beneficial　for　the　main　chamber　ignition.　The　lean　main　chamber　mixtures　realize　the　flame　ignition　mechanism　and　show　a　lower　ignition　delay.　The　increase　in　dissociation　ratio　enhances　the　tolerance　of　ignition　to　turbulence　and　leads　to　flame　ignition　mechanism.　The　increase　in　dissociation　ratio　also　enhances　the　inhibiting　effect　of　additional　nitrogen　(N2)　on　combustion,　but　the　ignition　mechanism　and　flame　shape　are　not　sensitive　to　the　additional　N2.