The　rare　earths　doped　Ca0.95RE0.05MnO3　(RE=Pr,　Eu,　Tb)　oxide　bulk　samples　are　prepared　by　combining　Sol-gel　method　and　ceramics　fabrication　method,　the　samples　have　been　analyzed　by　X-ray　diffraction,　scanning　electron　microscopy　and　electrical　constants　measuring　apparatus.　The　results　show　that　all　the　doped　samples　are　of　single　phase　with　dense　microstructure　within　the　5%　doping　content;　the　lattice　is　diminished　for　all　doped　samples;　the　un-doped　CaMnO3　exhibits　semiconductor　behavior　with　moderately　high　electrical　resistivity　reaching　340　mΩ·cm　at　373　K;　the　electrical　resistivity　for　the　doped　samples　is　reduced　with　identical　transportation　mechanism,　showing　slightly　enhanced　resistivity　value　along　with　Pr,　Eu　and　Tb;　the　energy　needed　for　polaron　carrier　to　hop　is　narrowed　by　doping;　the　praseodymium　doped　Ca0.95Pr0.05MnO3　sample　is　found　possessing　lowest　electrical　resistivity　reaching　8　mΩ·cm　at　373　K,　which　is　far　lower　than　that　of　the　parent　sample.