Discovering　high-performance　near-room-temperature　thermoelectric　materials　is　extremely　imperative　to　widen　the　practical　application　in　thermoelectric　power　generation　and　refrigeration.　Here,　ternary　Ag2Se1-xTex　(x　=　0.1,　0.2,　0.3,　0.4,　and　0.5)　materials　are　prepared　via　the　wet-mechanical　alloying　and　spark　plasma　sintering　process　to　investigate　their　near-room-temperature　thermoelectric　properties.　From　density　functional　theory　calculation　and　single-parabolic-band　modeling　study,　we　found　that　the　reduced　contribution　of　Se　4p　orbitals　to　the　total　density　of　states　decreases　the　carrier　effective　mass　with　increasing　Te　content,　which　should　enhance　the　theoretically　maximum　zT.　These　calculation　results　are　also　verified　by　the　experimental　results.　Meanwhile,　complex　microstructures　including　dislocations,　nanograins,　high-density　boundaries,　Te-Se　substitution,　lattice　distortions,　and　localized　strain　have　been　observed　in　ternary　Ag2Se1-xTex.　These　complex　microstructures　strengthen　phonon　scattering　and　in　turn　lead　to　ultralow　lattice　thermal　conductivity　in　the　range　of　0.21-0.31　W　m(-1)　K-1　in　ternary　Ag2Se1-xTex　at　300　K.　Although　the　increased　deformation　potential　suppresses　the　carrier　mobility,　benefiting　from　the　engineered　band　structures　and　ultralow　lattice　thermal　conductivity,　a　high　zT　of　＞1　can　be　potentially　obtained　in　the　ternary　Ag2Se1-xTex　with　appropriate　carrier　concentration.　This　study　indicates　that　ternary　Ag2Se1-xTex　is　a　promising　candidate　for　near-room-temperature　thermoelectric　applications.