Abstract: A cold cathode fluorescence flat lamp includes first substrate, second substrate, multiple spacers, multiple first electrodes, blue light fluorescent layer, and discharge gas. The first substrate has a first surface and the second substrate has a second surface. The second surface is opposite to the first surface. The first electrodes are disposed on the first surface of the first substrate. The blue light fluorescent layer is disposed on the second surface of the second substrate. The spacers connected with the edges of the first substrate and the second substrate for forming a chamber between the first substrate and the second substrate. The discharge gas distributes in the chamber. The first electrodes are disposed on the first surface of the first substrate and the blue light fluorescent layer is disposed on the second surface of the second substrate for being away from the plasma formed by the discharge gas.