A light source module for a scanning projection apparatus is provided. The light source module includes a plurality of point light sources and at least one light blocking unit. Each point light source is capable of providing a color light beam. The color light beams are combined into a combined light beam and the colors of the color light beams are different. The at least one light blocking unit is capable of being inserted into a transmission path of at least one of the color light beams at a fixed frequency to block a portion of the color light beam.