High-entropy　nitrides　(HENs)　have　been　extensively　studied　for　their　exceptional　mechanical　properties,　making　them　promising　candidates　for　surface　modification　in　machining　tools　and　aerospace　materials.　However,　the　mechanisms　by　which　nitrogen　content　influences　the　structure　and　mechanical　properties　of　HENs　remain　unclear.　This　study　constructed　a　theoretical　model　for　ordered　FCC_(AlCrMoTiV)1-XNX　HENs　based　on　the　site　occupying　fractions　(SOFs)　of　metal　atoms　and　the　preferred　occupying　distribution　(POD)　of　nitrogen　atoms.　Using　density　functional　theory,　we　investigated　the　microscopic　structure　and　mechanical　properties　of　these　nitrides.　The　results　show　that　the　nitrogen　content　significantly　affects　the　lattice　distortion　of　HENs　and　the　strength　of　chemical　bonding,　thereby　altering　their　mechanical　properties.　At　the　ground　state,　the　lattice　distortion　reaches　a　minimal　value　when　the　nitrogen　content　is　46.67　%,　and　the　Young＇s　modulus　E,　and　hardness　H　are　361.06,　and　22.58　GPa,　respectively.　In　addition,　we　further　predicted　the　temperature-　dependent　lattice　distortion　and　mechanical　properties　of　FCC_(AlCrMoTiV)1-XNX　HENs.　When　nitriding　reaches　saturation,　lattice　distortion　is　most　strongly　influenced　by　temperature.　The　HEN　with　41.82　%　nitrogen　content　exhibits　the　most　outstanding　mechanical　properties.　Even　when　the　temperature　rises　to　1273　K,　it　maintains　a　hardness　of　17.38　GPa　and　retains　its　ductility.