A stereo-image displaying apparatus including an adjustable light source module, a spatial modulator, and an image display panel is provided. The adjustable light source module is adapted for emitting a plurality of first illumination beams and a plurality of second illumination beams that are staggered along a first axis. The spatial modulator and the image display panel are sequentially disposed on the light path of the first and second illumination beams. The first illumination beam passes through the spatial modulator so that the image display panel displays a first view field image in a first frame period. The second illumination beam passes through the spatial modulator so that the image display panel displays a second view field image in a second frame period. Moreover, a method for reducing stereo-image cross-talk is also provided.