The　enhancement　of　thermoelectric　performance　should　be　a　compromise　of　electrical　as　well　as　thermal　transports　with　reasonably　little　reduction　of　thermopower.　In　this　study,　the　effects　of　co-doping　by　rare　earth　Pr　and　alkaline　earth　Sr　on　perovskite　Ca0.92-xPr0.08SrxMnO3　(x　=　0,　0.01,　0.02,　0.03,　0.04)　bulk　materials　are　evaluated　in　terms　of　the　phase　composition,　microstructure,　grain　combination,　electrical　transport　as　well　as　the　thermal　transport　properties.　The　results　show　that　perovskite　type　phases　are　reserved　for　the　doped　bulk　materials.　The　bulk　Material　porosity　can　be　decreased　obviously　and　better　grain　interconnection　is　formed　by　introducing　co-doping.　The　electrical　conductivity　is　enhanced　due　to　increased　carrier　concentration　and　mobility.　The　carriers　for　the　intrinsic　CaMnO3　and　the　co-doped　Ca0.92-xPr0.08SrxMnO3　(x　=　0,　0.01,　0.02,　0.03,　0.04)　bulk　materials　follow　the　adiabatic　polaron　transport　model;　the　activation　energy　as　well　as　the　band　gap　are　reduced.　The　total　thermal　conductivity　is　further　reduced　by　co-doping　of　Sr　comparing　with　the　Pr　single-doped　bulk　materials.　The　co-doping　is　effective　for　further　confining　the　thermal　conduction.　The　ZT　values　of　the　co-doped　samples　are　increased　by　12.5%,　18.7%,　25%　and　18.7%　comparing　with　the　Pr　single-doped　materials,　respectively.　(C)　2019　Elsevier　B.V.　All　rights　reserved.