Nano-sized　Scandia　Doped　Dispenser　cathode　made　from　Scandia　doped　tungsten　powder　has　been　paid　worldwide　attention　due　to　its　high　emission　and　satisfactory　emission　uniformity.　Among　the　adopted　doping　techniques　the　liquid-liquid　doping　by　Sol-Gel　process　is　the　most　favorable　for　the　performance　of　this　kind　of　cathode.　A　further　searching　on　the　details　of　the　processes　is　necessary　for　cathode　manufacturing.　In　this　study,　Sc2O3　contents　of　1%　wt.,　3%　wt.,　5%　wt.　and　7%　wt.　(named　Sc1,　Sc3,　Sc5　and　Sc7)　were　added　to　the　tungsten　powder;　their　effects　on　microstructures　and　emission　performance　of　the　produced　cathodes　were　investigated.　The　study　proved　that　the　nano-sized　Sc2O3　particles　are　getting　richer　from　Sc1　to　Sc7　but　cover　on　the　W　grains　in　all　cases.　While　there　is　a　slight　decrease　in　porosities　from　Sc1　to　Sc7,　the　filled　impregnant　of　Ba　Ca　aluminates　for　Sc1　to　Sc5　is　satisfied　the　requirement　for　dispenser　cathode,　but　is　obviously　lower　for　Sc7.　All　cathodes　made　from　Sc3,　Sc5　and　Sc7　reach　a　Space　Charge　Limited　current　density　of　about　50A/cm(2)　at　true　temperature　of　960　degrees　C　except　Sc1　of　33A/cm(2).　The　knee　points　at　initial　current　density　of　30A/cm(2)　are　830　degrees　C,　875　degrees　C　and　920　degrees　C　for　Sc5,　Sc3　and　Sc7,　respectively.　Almost　no　knee　can　be　observed　for　Sc1.　Therefore,　Sc5　and　Sc3　exhibit　the　best　emission　and　emission　uniformity,　Sc7　comes　second　and　Sc1　goes　the　worst.