n-Type　thermoelectric　powders　of　(Bi2-x　Ag　(x)　Te-3)(0.96)-(Bi2Se3)(0.04)　(0　＜=　x　＜=　0.05)　have　been　synthesized　by　mechanical　alloying　and　then　consolidated　by　spark　plasma　sintering.　The　analysis　results　show　that　the　grain　size　of　pure　Bi,　Te,　Ag,　and　Se　powders　is　decreased　to　about　1　mu　m　to　0.5　mu　m　after　they　are　mechanically　alloyed　for　2　h.　The　power　factor　of　bulk　material　increases　with　increasing　Ag-doping　content,　while　the　trend　for　the　lattice　thermal　conductivity　is　the　opposite.　Bulk　(Bi0.99Ag0.04)(2)(Te0.96Se0.04)(3)　after　milling　for　12　h　exhibits　a　higher　power　factor,　lower　thermal　conductivity,　and　thus　a　higher　ZT　of　0.74　at　373　K.