In　this　paper,　the　Ca11.52Sr0.48Al14O33　+　Ca2.88Sr0.12Al2O6　of　a　specific　stoichiometric　ratio　is　used　as　a　precursor.　The　[Ca23.04Sr0.96Al28O64](4+)(4e(-))　electrides　block　with　a　high　electron　concentration　successfully　prepared　by　in-situ　aluminothermic　reaction　using　a　spark　plasma　sintering　system(SPS).　The　sintering　temperature　is　1050　degrees　C,　and　the　holding　time　is　5　min.　The　UV　spectrophotometer　results　showed　that　(Ca0.96Sr0.04)12A7:e(-)　showed　the　visible　UV　absorption　peak　at　around　2.5　eV,　and　the　electron　concentration　was　calculated　to　reach　2.2　x　10(21)　cm(-3).　Simultaneously,　the　electronic　structure　is　analyzed　by　a　paramagnetic　resonance　spectrometer,　and　the　result　shows　that　electrons　are　injected　uniformly　in　the　sample.　The　synchronous　thermal　analyzer＇s　results　showed　that　(Ca0.96Sr0.04)12A7:e(-)　weight　loss　occurred　above　700　degrees　C　was　derived　from　oxygen　desorption.　These　results　altogether　demonstrate　that　electrons　are　efficiently　injected　into　the　cage　structure　of　(Ca0.96Sr0.04)12A7:e(-).　This　process　provides　a　new　electron-injection　method,　which　significantly　shortens　the　preparation　cycle　of　(Ca0.96Sr0.04)12A7:e(-)　and　makes　mass　production　of　samples　possible.　The　electronic　structure　of　(Ca0.96Sr0.04)12A7:e(-)　calculated　using　first-principles.　The　results　show　a　cage　conduction　band　(CCB)　between　-　1　eV　and　0.7　eV,　which　is　favorable　for　electrical　performance.　The　results　also　show　that　the　excellent　electrical　transport　performance　of　(Ca0.96Sr0.04)12A7:e(-)　mainly　comes　from　Sr,　Ca　atom　s-state　electrons,　and　Al　atom　p-state　electrons.　(C)　2021　Elsevier　B.V.　All　rights　reserved.