C12A7:e(-)　electrides　are　potentially　useful　in　various　technological　applications.　However,　it　usually　needs　to　be　synthesized　through　a　complicated　multistep　process　under　severe　conditions.　Therefore,　the　search　is　on　for　a　more　facile　and　direct　process　that　occurs　under　milder　conditions.　Here,　a　facile　and　efficient　synthesis　strategy　has　been　developed　for　the　rapid　production　of　highly　conductive　C12A7:e(-)　directly　from　commercially　available　chemical　ingredients　of　CaO,　Al2O3,　and　Al　powders　at　1200　degrees　C　in　a　10(-2)　Pa　vacuum　for　20　minutes　using　SPS　process.　The　electron　concentration　in　the　as-prepared　C12A7:e(-)　was　enhanced　up　to　2.13　x　10(21)　cm(-3)　by　simply　regulating　the　addition　amounts　of　Al,　covering　IM　transition.　The　electronic　structure　results　indicated　the　formation　of　homogeneous　trapped　electrons　in　the　lattice.　Further　thermal　analyses　illustrated　that　Al　made　a　dual　function　of　reducing　agent　and　and　reaction　promoter,　which　remarkably　reduced　the　formation　temperature　of　mayenite　structure.　This　study　fills　in　the　gaps　of　direct　formation　mechanisms　of　conductive　mayenite　phase,　and　provides　a　new　perspective　to　regulate　the　resultant　N-e.