Bulk　skutterudite　(FeNi)(x)Co4-xSb12　with　x　varying　from　0.05　to　1.0　were　prepared　by　mechanical　alloying　and　spark　plasma　sintering　(MA-SPS).　The　phases　of　the　samples　were　analyzed　by　X-ray　diffraction,　and　their　thermoelectrical　properties　were　tested　by　electrical　constant　instrument　and　laser　thermal　constant　instrument.　The　experimental　results　show　that　bulk　(FeNi)(x)Co4-xSb12　have　the　characteristic　of　typical　semiconductor　electricity.　The　addition　of　FeNi　improves　the　electrical　properties　to　a　large　extent;　the　samples　of　bulk　(FeNi)(x)Co4-xSb12　(x　=　0.05-1.0)　are　n-type　semiconducting　materials;　the　increase　of　FeNi　content　can　decrease　the　absolute　value　of　Seebeck　coefficient　and　therefore　decrease　the　ZT　value;　FeNi　with　a　higher　content　when　x　＞　0.5　leads　to　an　evident　increase　in　thermal　conductivity　and　also　a　decrease　in　ZT　value.　In　general,　for　ZT　value,　the　optimal　added　content　of　FeNi　is　0.25-0.5　and　the　maximum　ZT　value　is　0.2467　when　x　=　0.5　at　500　degrees　C.　(C)　2008　University　of　Science　and　Technology　Beijing.　All　rights　reserved.