This Paper explores the origin of the shape of the character "亞" of Ming-Tang. First, We analysed the structure in shape of character "亞" of the architectural site of Da-Di-Wan F901 and the royal tombs of the Yin-Shang Period. Follow that, We compared the various structure in shape of the character "亞" in Pre-Qin books and records. Finally, We depicted the process desiging and constructing of Ming-Tang of the Han Dynasty.