n-type　Bi-2(Te0.90Se0.10)(3)/(SiC)(y)　(0　＜=　y　＜=　0.01)　composites　with　nano-SiC　were　fabricated　by　mechanical　alloying　combined　with　microwave　sintering.　The　microstructure　and　thermoelectric　properties　of　Bi-2(Te0.90Se0.10)(3)/(SiC)(y)　were　studied　systematically.　The　nano-SiC　particles　as　the　phonon　scattering　center　uniformly　distributed　in　the　matrix,　with　little　effect　on　the　electric　transport　performance　and　significantly　reducing　the　thermal　conductivity　of　n-type　Bi-2(Te0.90Se0.10)(3)/(SiC)(y)　(0　＜=　y　＜=　0.01).　The　introduction　of　nano-SiC　optimizes　the　thermoelectric　performance,　and　the　sample　with　SiC　y　=　0.0075　obtains　the　highest　ZT　similar　to　0.94　at　323　K.