Bismuth　and　Tellurium　nanoparticles　were　prepared　by　evaporation-condensation　method　in　argon　atmosphere,　and　n-type　Bi2Te3　fine-grained　thermoelectric　bulk　materials　were　fabricated　by　spark　plasma　sintering　(SPS)　at　different　temperatures　from　663　to　723　K　using　mechanically　alloyed　(MA)　powders.　The　phase　compositions　of　powder　and　bulk　samples　were　characterized　by　X-ray　diffraction　(XRD).　The　sizes　and　microscopic　structures　of　nanoparticles　and　fractured　cross　section　of　the　bulk　samples　were　observed　by　transmission　electron　microscopy　(TEM)　and　scanning　electron　microscopy　(SEM),　respectively.　The　thermoelectric　transport　properties　were　measured　at　323　similar　to　473　K.　The　results　show　that　electrical　transport　properties　are　almost　unchanged　but　thermal　conductivity　is　reduced　significantly　from　1.93　W/m.K　to　1.29　W/m.K　at　423　K　for　the　fine-grained　bulks　prepared　by　nanoparticles　comparing　with　coarse-grained　materials.　The　maximum　ZT　value　after　SPS　at　693　K　reaches　0.68　at　423　K.