The digital design of cultural heritage relics provides a new method for their conservation, preservation and utilization. Based on digital design theories and methods used for making cultural heritage objects, we reviewed key technologies for the three-dimensional digital design for cultural heritage objects, developed a computer-aided, three-dimensional digital reconstruction method, and proposed the idea of three-dimensional mesh texture mapping using two-dimensional image calibrations. We tested this method by doing three-dimensional digitization of an unearthed bronze bovine object of the late Shang dynasty and constructing a complete design framework, thus verifying our theories and methods.