The　rare　earths　doped　Ca0.95RE0.05MnO3　(RE=Pr,　Eu,　Tb)　oxide　bulk　materials　are　fabricated　and　the　effects　of　rare　earths　doping　within　low　content　on　the　thermoelectric　transport　properties　of　the　CaMnO3　oxide　have　been　investigated.　The　results　show　that　all　doped　oxide　bulk　materials　are　single　phase　with　consolidated　microstructure.　The　electrical　resistivity　is　remarkably　reduced　on　account　of　electron　carrier　density　and　mobility　enhancement.　The　Seebeck　coefficient　is　simultaneously　reduced　and　the　total　thermal　conductivity　is　decreased　due　to　phonon　thermal　conduction　confinement.　The　thermoelectric　figure　of　merit　ZT　is　improved　with　peak　values　of　0.12,　0.12　and　0.09　at　973　K　for　the　Pr,　Eu　and　Tb　doped　CaMnO3　oxide　materials,　respectively,　which　are　very　much　higher　than　that　of　the　undoped　oxide　material.