1, the Qin Dynasty is a square hole copper coin, commonly known as "Qin Banliang"; It was five baht in the Han Dynasty.

2. The unified currency name of the Qin Dynasty was Qin Banliang. Before the Qin Dynasty unified the six countries, coins of different countries had different shapes, such as shovel coins, knife coins and ring coins. , and can only be circulated in their respective jurisdictions;

3. After the unification of the six countries, Qin Shihuang decided to unify the statutes, weights and measures, currency and writing, abolish the old coins of the six countries at the end of the Warring States period, and improve them on the basis of the semi-good money of Qin in the Warring States period. Qin Banliang's round square hole coins swept the country, ending the chaotic state of different shapes and weights of money in ancient China.