The　electronic　and　the　electrical　properties　of　the　Sr　doped　CaMnO3　oxide　for　Ca　site　are　studied　by　the　density　funtional　theory　calculation　method.　The　Sr　doped　CaMnO3　oxide　bulk　samples　are　prepared　by　the　citrate　acid　sol-gel　method　as　well　as　the　ceramic　preparation　method,　and　the　thermoelectric　transport　properties　are　analyzed.　The　results　show　that　the　Sr　doped　CaMnO3　oxide　still　has　the　indirect　band　gap　yet　with　the　band　gap　energy　slightly　decreasing　from　0.756　eV　to　0.711　eV.　The　effective　mass　of　carrier　near　Fermi　level　is　modified　and　the　carrier　density　near　Fermi　level　is　also　increased.　The　ability　to　release　electrons　of　Sr　is　stronger　than　that　of　the　Ca,　and　the　Sr　acts　as　n-type　donor　doping　specy　within　the　CaMnO3　compound.　The　electrical　resistivity　values　remarkably　decrease　for　the　Sr　doped　CaMnO3　oxide　materials.　The　Seebeck　coefficient　increases　slightly　to　a　certain　extent　compared　with　that　of　the　intrinsic　CaMnO3.　The　resistivity　values　for　the　Ca1-xSrxMnO3　(x　=　0.06,　0.12)　samples　at　373　K　decrease　to　25%　and　21%　of　the　un-doped　intrinsic　CaMnO3　sample,　respectively.　The　Seebeck　coefficients　for　the　Ca1-xSrxMnO3　(x　=　0.06,　0.12)　samples　at　373　K　increase　to　as　high　as　112.9%　and　111.1%　of　the　Seebeck　coefficient　for　un-doped　intrinsic　sample,　respectively.　The　thermoelectric　performance　is　effectively　enhanced　by　Sr　doping　for　the　CaMnO3　oxide　material.