Mayenite-derived　electride　[Ca24Al28O64](4+)(4e(-))　has　been　successfully　synthesized　via　an　aluminothermic　reaction　of　Ca3Al2O6　(C3A),　Al2O3,　and　Al　powders　at　1070　degrees　C　for　10　min　using　spark　plasma　sintering　(SPS)　process　in　a　vacuum.　The　C3A　precursors　were　directly　derived　from　high　temperature　calcinating　in　an　ambient　atmosphere.　The　as-synthesized　C12A7:e(-)　exhibits　an　electron　density　of　similar　to　2.3　x　10(21)cm(-3),　a　spin　concentrations　of　similar　to　6.7　x　10(19)cm(-3)　and　optical　absorption　bands　of　0.5eV　and　2.48ev　at　room　temperature.　Electronic　structure　was　also　evaluated　by　electron　paramagnetic　resonance　(EPR).　The　appearance　of　Dysonian　characteristic,　a　typical　feature　of　good　electronic　conductors,　strongly　suggested　the　formation　of　conductive　mayenite　structure.　This　developed　and　efficient　route　not　only　proposes　an　modified　precursor　for　the　synthesis　of　high-quality　C12A7:e(-)　but　also　provide　more　comprehensive　insights　into　mayenite　research.