C12H10Ca3O14　+　Al2O3　powders　are　used　as　precursors,　and　the　dense　[Ca24Al28O64](4+)(4e(-))　(C12A7:e(-))　ceramic　block　with　high　electron　density　is　quickly　synthesized　in　one　step　under　a　spark　plasma　sintering　(SPS)　process　with　a　temperature　of　1000　degrees　C　and　a　time　of　5　minutes.　The　microstructure　and　composition　analysis　results　show　that　the　synthesized　C12A7:e(-)　is　dense　(99.7%),　has　no　defects,　and　no　impurities　are　introduced.　The　electronic　structure　analysis　results　show　that　the　electron　concentration　of　the　sample　is　2　x　10(21)　cm(-3).　This　method　realizes　the　self-reduction　of　the　sample　through　the　CO　gas　generated　during　the　sintering　process,　avoids　the　introduction　of　impurities,　and　dramatically　simplifies　the　process.　These　results　provide　a　potential　path　for　the　rapid　fabrication　of　a　large　number　of　C12A7:e(-)　with　high　electron　concentration　and　provide　a　basis　for　its　practical　applications　such　as　cold　cathode　fluorescent　lamp　and　catalyst　carrier.