We developed the new electron gun, which can emit about twice electron in comparison with the conventional gun and could achieve the screen brightness of over 300cd/m^2 even if the ordinal driving circuit is applied. We tried two methods to improve the drive characteristics, and we chose to lower the cathode cut-off voltage (1). To maintain the resolution, we optimized the triode. And we used the tungsten-coated oxide cathode to guarantee the long life.