The　electrical　transport　coefficients　of　anti-ferromagnetic　CaMnO3　have　been　investigated　by　density　functional　theory　calculation　within　generalized　gradient　approximation.　The　calculated　transport　coefficients　exhibit　the　anisotropic　nature,　in　agreement　with　its　electronic　states.　The　transport　property　results　reveal　the　stronger　carrier　transport　along　the　O1-Mn-O1　plane　within　the　O-Mn-O　octahedron,　indicating　that　the　Mnd　and　O1p　orbitals　are　mainly　responsible　for　electrical　transport.　The　maximum　power　factor　values　as　a　function　of　relaxation　time　reach　8.4　x　10(23)　Wm(-1)　K-2　s(-1),　7.9　x　10(23)Wm(-1)　K-2　s(-1)　and　4.9　x　10(23)　Wm(-1)　K-2　s(-1)　within　c,　a　and　b　direction,　respectively.　The　dimensionless　figure　of　merit　ZTxx,　ZTyy　as　well　as　ZTzz　is　estimated　with　128,　0.8　and　137　at　1000　K,　respectively.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.