This　work　aims　to　comparatively　investigate　the　NH3　blending　effects　on　the　combustion　of　light　alkanes,　CH4/C2H6/C3H8,/nC(4)H(10).　The　laminar　burning　velocity　(S-u(0))　and　burned　gas　Marstein　length　of　the　stoichiometric　alkane/NH3　blends　were　measured　at　298　K,　0.1　MPa　using　expanding　spherical　flame　and　compared　with　the　six　mechanisms.　Detailed　kinetic　analyses　were　conducted　using　a　newly　developed　mechanism.　The　results　show　that　the　S-0(u)　of　each　alkane　exhibits　a　distinctive　response　to　NH3　introduction,　which　amplified　the　difference　of　S-u(0)　for　the　binary　fuels.　The　C2H6/NH3　blend　exhibits　the　maximum　S-u(0)　at　low　ammonia　fraction　but　exceeds　by　nC(4)H(10)/NH3　at　intermediate　and　high　ammonia　fraction.　The　S-u(0)　reduction　caused　by　NH3　blending　is　dominated　by　the　scavenging　effect　on　the　OH　and　H　radicals　and　less　affected　by　the　C-N　interactions　under　all　studied　conditions.　Consequently,　the　S-u(0)　of　larger　alkanes　are　less　influenced　by　the　NH3　blending　because　of　their　diverse　production　sources　of　OH　and　H　radicals.　Due　to　the　competitive　effect　of　increased　mixture　Zel＇dovich　number　and　decreased　Lewis　number,　burned　gas　Markstein　length　of　the　binary　fuels　tend　to　increase　firstly　and　then　decrease　with　increased　NH3　fractions.　In　addition,　ammonia　blending　energy　fraction　may　be　a　more　proper　criterion　in　practical　engineering　usage　compared　with　mole　fraction,　since　the　energy　fraction　of　NH3　governs　the　relative　reduction　of　S-u(0)　and　CO2　emissions　independent　of　the　alkane　types,　and　these　parameters　are　the　major　concerns　in　NH3　blending　combustion.