Polycrystalline　Cr-doped　higher　manganese　silicides　(HMSs)　Mn1-　Cr　Si-1.80　(　=　0　to　0.03)　were　prepared　by　the　spark　plasma　sintering　method.　The　phase　structure　and　microstructure　of　the　bulk　samples　were　investigated,　and　their　thermoelectric　(TE)　properties　were　measured　from　473　K　to　873　K.　x-Ray　diffraction　patterns　show　that　almost　all　of　the　Cr-doped　samples　possess　single-phase　HMS　structure.　However,　minor　amounts　of　MnSi　phase　can　be　observed　in　scanning　electron　microscopy　images.　The　electrical　conductivity　increases　continuously　with　increasing　Cr　substitution,　and　is　enhanced　by　up　to　15%　for　bulk　Mn0.97Cr0.03Si1.80　over　the　entire　measurement　range　from　473　K　to　873　K.　Meanwhile,　the　Seebeck　coefficient　is　slightly　depressed,　so　that　the　power　factor　is　increased　by　about　10%.　Cr　doping　affects　the　thermal　conductivity　negatively,　and　the　overall　dimensionless　TE　figure　of　merit　of　all　the　samples　decreases　slightly　due　to　the　higher　thermal　conductivity.