Adding　dissociated　ammonia　(NH3)　is　an　effective　way　to　improve　the　combustion　properties　of　NH3.　Research　on　the　laminar　burning　velocity　of　partially　dissociated　NH3　mixtures　was　shown　in　part　I.　In　order　to　further　explore　the　feasibility　of　enhancing　ammonia　combustion　by　adding　dissociated　ammonia,　several　essential　combustion　properties　were　numerically　studied　in　part　II　of　this　study.　The　burned　gas　Markstein　length　was　obtained　by　the　experiment　and　theoretical　calculation,　and　the　relevant　combustion　parameters　such　as　adiabatic　flame　temperature,　heat　release　rate　and　NO　formation　were　calculated　by　planar　flame　simulation.　Results　show　that　the　Markstein　length　increases　with　the　increasing　dissociating　degree　on　the　lean　side,　but　decreases　under　rich　conditions,　which　is　mainly　due　to　the　determination　of　flame　thickness,　effective　Lewis　number　and　Zel＇dovich　number.　The　addition　of　dissociated　NH3　increases　the　mixture　heating　value,　but　the　combustion　efficiency　decreases　slightly.　The　primary　exothermic　elementary　reactions　in　the　combustion　are　gradually　replaced　by　the　reactions　in　the　H2　system,　and　the　exothermic　process　shifts　to　a　lower　temperature　with　the　increase　of　dissociating　degree.　NO　is　the　main　NOx　emission,　the　formation　of　NO　is　determined　by　the　concentration　of　the　O/H　radicals　and　NH3,　its　mole　fraction　first　increases　and　then　decreases　with　the　increase　of　dissociating　degree.　Moreover,　the　NO　emission　on　the　rich　side　only　decreases　slightly　under　high　dissociating　degree　conditions,　which　is　different　from　the　significant　plummet　under　the　low　and　medium　dissociating　degree　conditions.