Abstract: Control method and system for improving the color temperature of an alternating current (AC) plasma display panel (PDP) are disclosed. The method and apparatus controls the color temperature of an AC PDP and can maintain high luminance and luminous efficiency even in an XGA class discharge cell as well as a VGA class discharge cell because a discharge space is dispersed from a sustain electrode to the direction of a writing electrode, to thus obtain strong sustain discharge having a large discharge space when a pulse is simultaneously applied to the writing electrode while a sustain pulse waveform is applied during a sustain period of the AC PDP improves only the bright of a blue cell whose luminance is relatively low regardless of a cell structure because different pulses can be independently applied to the writing electrodes of red, blue, and green cells during the application of the sustain pulse, and controls a color temperature by increasing the luminance of the blue and green cells.