Uniform　scandium　doped　tungsten　powder　was　prepared　by　sol-gel　method　combined　with　reduction　process,　and　then　the　scandium　doped　impregnated　cathode　was　successfully　prepared　by　microwave　sintering.　The　characteristics　of　Sc-doped　tungsten　powder,　the　microstructure　of　cathode　sponge　matrix,　the　emission　properties,　and　the　surface　behavior　of　the　active　substance　were　analyzed.　The　result　shows　that　the　scandium　doped　tungsten　powder　has　the　average　size　of　around　1　µm　and　Sc　element　is　uniformly　distributed.　The　morphology　of　the　sponge　skeleton　is　spherical,　the　pore　distribution　is　uniform,　the　average　pore　diameter　is　about　0.46　μm,　and　scandium　is　evenly　distributed　in　the　matrix.　The　cathode　prepared　by　the　microwave　sintering　method　exhibits　good　emission　properties,　e.g.,　the　current　density　of　this　cathode　reaches　137.59　A/cm2　at　950℃b,　and　the　emission　slope　is　1.431.　The　atomic　ratio　of　Ba:Sc:O　on　the　cathode　surface　is　1.8:1:2.2　after　activation,　and　a　large　amount　of　nanoparticles　are　present　on　the　cathode　surface,　which　promotes　emission　of　the　cathode.　©　2020,　Science　Press.　All　right　reserved.