Bulk　CoSb3　with　single　phase　was　synthesized　by　mechanical　alloying　and　spark　plasma　sintering　(MA-SPS).　The　thermoelectric　properties　of　bulk　CoSb3　prepared　by　different　technologies　were　investigated.　All　samples　have　the　character　of　typical　semiconductor　electricity　and　their　thermoelectric　figures　of　merit　(ZT)　get　the　maximum　values　at　400　degrees　C.　The　highest　ZT　value　is　0.0571,　belonging　to　the　sample　sintered　at　600　degrees　C　among　all　samples　at　all　temperatures.