The present disclosure relates to a pixel arranging method. A repeating unit consists of a first structural unit and a second structural unit that are repeatedly arranged in the horizontal direction respectively, and are alternately arranged in the vertical direction; the first structural unit and the second structural unit respectively comprises seven sub-pixels, the seven sub pixels includes two sub-pixels of a first color, two sub-pixels of a second color, two sub-pixels of a third color and one sub-pixel of a fourth color; or two sub-pixels of the first color, one sub-pixel of the second color, two sub-pixels of the third color and two sub-pixels of the fourth color. The present disclosure also relates to a sub-pixel rendering method and an image display device. In case of limited manufacturing processes, the resolution can still be increased, while power consumption can be lowered.