Effect　of　homogenization　of　the　chemical　composition　and　crystal　structure　on　the　magnetocaloric　effects　have　been　studied　for　bulk　Mn1.1Fe0.9P0.8Ge0.2　alloy　prepared　by　mechanical　alloying　and　subsequent　spark　plasma　sintering　method.　After　optimal　homogenization　treatment,　the　ferromagnetic　impurity,　Ge6Fe3Mn4　phase　was　completely　eliminated　from　the　alloy;　furthermore,　the　crystal　lattice　constant　of　the　MnFePGe　main　phase,　which　possesses　a　hexagonal　Fe2P-type　structure,　varies　obviously　compared　with　that　of　the　sintered　sample.　As　a　result,　the　Curie　temperature,　T-C,　of　the　alloy　increases　from　253　to　267.5　K　and　the　maximum　magnetic　entropy　change,　vertical　bar　Delta　S-m　vertical　bar,　also　increases　from　36.36　to　44.35　J/kg　K　under　3　T　magnetic　field.　Furthermore,　the　thermal　hysteresis　of　M-T　curves　around　T-C　upon　heating　and　cooling,　a　signature　of　a　first-order　magnetic　phase　transition,　reduces　from　15　K　for　as-sintered　sample　to　9　K　for　annealed　sample.　(C)　2010　American　Institute　of　Physics.　[doi:　10.1063/1.3358620]