A lighting system for a digital cinema projection apparatus is provided. The lighting system includes an ultra high pressure mercury lamp, a relay lens group, a digital micro display module, an optical filter module, and a projection lens. The ultra high pressure mercury lamp is used for emitting a light beam. The relay lens group is used for receiving the light beam and adjusting an optical path of the light beam. The optical filter module is arranged along the optical path of the lighting system for optically modulating an optical spectrum and/or a white balance of the light beam from the ultra high pressure mercury lamp. The projection lens is used for projecting the modulated light beam as an image beam.