Scandia　doped　tungsten　powders　were　prepared　by　spray　drying　combined　with　two-step　hydrogen　reduction.　The　particle　size　of　doped　tungsten　powder,　powder　morphology　and　doped　tungsten　matrix　were　characterized　by　scanning　electron　microscope,　X-ray　diffraction　and　laser　diffraction　particle　size　analyzer,　respectively.　The　reduction　behavior　of　Sc2O3　doped　tungsten　oxide　and　the　effect　of　Sc2O3　on　the　property　of　tungsten　powder　were　studied　by　the　temperature　programmed　reduction.　The　experimental　results　showed　that　the　precursor　powders　prepared　by　spray　drying　had　spherical　shape.　The　addition　of　Sc2O3　could　decrease　the　reduction　temperature　of　tungsten　oxide.　The　scandia　doped　tungsten　powder　had　sub-micrometer　size　in　the　range　of　0.1　to　1　mu　m　and　scandium　distributed　evenly　in　the　powder.　By　using　this　kind　powder,　sub-microstructure　cathode　matrices　with　semispherical　grains　and　homogenous　distribution　of　scandium　were　obtained.