Sr-doped　single　crystals　(C1-xSx)12A7:e(-)　(x　=　0,　0.01,　0.02,　0.03)　were　successfully　fabricated　by　floating　zone　method.　It　is　found　that　Sr-doping　decreases　the　reduction　time　from　30　h　to　20　h.　The　maximum　emission　current　of　(C1-xSx)12A7:e(-)　is　greatly　improved　by　50%　than　that　of　the　un-doped.　The　DFT　calculations　show　Sr-doping　in　C12A7　contributed　to　the　free　O2-　in　the　cages　spread　out,　leading　to　a　short　reduction　time;　increase　the　＂window＂　between　two　adjacent　cages　that　is　conducive　to　the　electrons　in　cages　to　escape.　And　the　work　function　of　the　(C1-xSx)12A7:e(-)　is　lower　than　that　of　C12A7:e(-).