A new thermionic electron emission material has been studied. The electron emission proper- ties and microstructure of Y-Mo(Mo-Y_2O_3) wire with content of 3/100～5/100 Y_2O_3 have been systematically in- vestigated by means of electron tube emission and electron microscope. The results showed that the Y-Mo ma- terial has very good electron emission ability, higher emission efficiency and lower operation temperature than those of Th-W cathode, respectively. In addition, Y-Mo cathode electron tube exhibits more stable emission current than that of La-Mo ones.
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