Single-phase　Si80Ge20B0.6　alloy　bulks　were　prepared　by　high-energy　ball　milling　followed　by　spark　plasma　sintering　method.　The　thermoelectric　properties　were　measured　from　400　to　900K.　The　carriers　were　scattered　by　grain　boundaries　in　the　alloys　prepared　by　powder　metallurgy.　The　bulk　specimens　heated　for　a　longer　period　of　time　during　SPS　had　higher　electrical　conductivity.　The　thermal　conductivity　values　for　all　specimens　were　between　2.7　and　4.5　W/(m·K).　The　figure　of　merit　ZT　of　the　holding　for　9　min　specimen　reached　0.47　at　900K.