The invention provides a DLP rear projective television light source and the control method thereof, and has the advantages that the service life is long, the color gamut coverage area is wide, and adisplaying image has no rainbow effect. The DLP rear projective television light source consists of a LED, a LED driving power supply circuit and a LED control circuit, the LED driving power supply circuit is connected to the drain electrode of a field effect tube, the LED control circuit is connected to the grid electrode of the field effect tube, and the LED is connected to the source electrodeof the field effect tube. The invention adopts the LED as the DLP rear projective television light source, thereby greatly improving the light source service life of a DLP system, improving the colorgamut coverage area of the DLP system and leading the DLP color to be more fresh; and because the invention cancels a color wheel, the displaying image has no rainbow effect.