The　powders　of　n-type　(Bi1-xAgx)(2)　(Te(1-y)Sey)(3)　thermoelectric　materials　were　synthesized　by　mechanical　alloying　and　consolidated　by　spark　plasma　sintering.　The　milled　powders　were　investigated　by　XRD　and　SEM,　which　shows　that　the　pure　Bi,　Te,　Ag　and　Se　particles　were　alloyed　after　milling　for　2　It.　With　the　increase　of　the　time　of　mechanical　alloying,　the　size　of　the　powder　grains　decreases　to　about　1-0.　5　mu　m.　The　effects　of　the　doped　elements　on　the　thermoelectric　properties　have　been　studied.　It　was　found　that　Ag　can　improve　the　power　factor　and　decrease　the　lattice　thermal　conductivity,　the　compound　(Bi0.99Ag0.01)(2)(Te0.96Se0.04)(3)　after　milling　for　10　h　possesses　the　highest　value　of　the　power　factor　and　minimum　thermal　conductivity,　which　results　in　the　highest　value　of　ZT　of　0.52　at　323　K.