This is a flat displayer of V shape overlaping cathode structure and its production process. It includes a sealed vacuum chamber formed by a anodic glass panel, a cathode glass panel and surrounded glass frame; on the anodic glass panel is a conducting layer coated with fluorescent; a supporting wall between the anodic and cathode panel and a getter; on the cathode glass panel are a grid down-lead layer, carbon nanotube and V shape overlapping cathode structure, which is capable of increasing the efficiency and area of electron ejection by the nanotube and the display quality.