The　electronic　properties　of　Sr　doped　CaMnO3　are　studied　using　the　first　principle　density　functional　theory　calculation　based　on　a　plane　wave　basis　and　pseudopotentials.　The　thermoelectric　properties　are　analyzed　on　the　basis　of　electronic　properties.　The　band　structure　results　show　that　the　doped　system　undergoes　a　semiconductor-to-conductor　transition　and　the　bands　near　Fermi　level　experience　a　significant　distortion;　the　density　of　states　results　show　that　the　density　of　states　near　Fermi　level　is　increased.　The　combination　of　Mnd　and　Op　orbitals　exhibits　enhanced　covalence　nature.　It　is　estimated　that　the　thermopower　and　carrier　conduction　capability　should　be　enhanced,　and　the　phonon　conduction　should　be　depressed,　indicating　the　improved　thermoelectric　properties　for　Sr　doped　CaMnO3　system.　(C)　2011　Elsevier　B.V.　All　rights　reserved.