1. An image display method for a stereo display apparatus, the image display method comprising: providing a stereo display apparatus, wherein the stereo display apparatus comprises a periodic structure and a pixel plane; dividing N view zones in a space; forming a plurality of projection areas corresponding to each of the view zones on the pixel plane by the periodic structure, wherein each of the projection areas corresponds to at least one sub-pixel unit on the pixel plane; obtaining an image information of each view zone according to the corresponding sub-pixel units; adjusting a display content of the pixel plane according to a distance between a viewer and the stereo display apparatus; comparing each of the sub-pixel units to determine whether each of the sub-pixel units corresponds to two or more view zones, and displaying a stereo image by blending the image information of each view zone, wherein if each of the sub-pixel units does not correspond to two or more view zones, in the step of obtaining image information of each view zone, the image information of each of the sub-pixel units is regarded as the image information of the corresponding view zone, wherein if each of the sub-pixel units corresponds to two or more view zones, in the step of obtaining image information of each view zone, the image information of each of the sub-pixel units is superposed according to a projection capacity of the projection area corresponding to each view zone, so as to obtain the image information of each view zone.