1. Mirror inscription originated in the Western Han Dynasty. Most of the bronze mirrors before the Han Dynasty were single-sided mirrors, which were called single-mirror inscriptions. Later, with the improvement of bronze mirror manufacturing level, a double-sided mirror gradually appeared, and its two sides can be called double-sided inscriptions according to people. Later, many inscriptions appeared on the same side, from dragon patterns and landscape patterns to fine print, numbers, flowers, insects and fish, which were collectively called "multi-inscriptions". The "descendants of Changyi" belong to the latter, and it is said that it appeared in the middle and late Western Han Dynasty, which also shows the maturity of this skill.
2. The main decorative patterns in the mirror inscription of Descendants of Changyi are: Gai Yun beast, Da Xiao Yun, Bo Gu, Ruyi Yuntou, Juan Cao, etc. These decorative patterns not only have auspicious meanings, but also have the effect of exorcising evil spirits and protecting the body
3. It appeared in the middle and late Western Han Dynasty, which revealed that people were very concerned about longevity, health and longevity, and also reflected that there were many problems in society at that time, such as frequent diseases, high mortality, labor shortage and low productivity.