In order to make a nice hologram, a new method to create a color dynamic hologram by computer coding was proposed. According to the colorimetry principles and the sampling principle, an object point of every behaves can be resolved into three primary color objects as red, blue and green, whose coordinate data are coded by the computer in order to let their monochromatic stereoscopic holograms have a pefect overlap when they are placed in a plane and reappeared by conjugate light. The overlapping images interferenced with the reference light to form a dynamic color hologram. The experiment shows that a dynamin visual can be seen with the movement of the position of the eyes when the color hologram is reproduced. This method can effectively solve the problem that difficult overlap of images with low experimental conditions, which also avoid some unnecessary noise with simple operation, and has good application value in 3-D display.