Bronze mirrors were popular in Yin Shang, Spring and Autumn Period and Warring States Period. Among them, the bronze mirror of the Warring States period is exquisite and light, with geometric patterns on the back and small buttons. The bronze mirror of Yin Shang Dynasty is characterized by slightly convex or flat mirror surface, round shape and thin mirror body. The back decoration is simple, usually decorated with convex strings for several weeks, and some strings are decorated with small breast nails and radial vertical lines. The chest nail pulse mirror and multi-ring convex string mirror unearthed from Fu Hao's tomb in Yinxu, Anyang, Henan Province all have the above characteristics.