The currency of Qin. Before Shang Yang's reform, Qin's national power was weak and it was less likely to mint money, and no historical records or physical evidence have been found yet. If there is coinage in circulation, it may also be currency flowing in from other countries. During the reign of Qin Xiaogong, Shang Yang went to Wei to join Qin and carried out reforms. As Qin gradually became stronger, it was possible to mint coins. The Warring States Period began in Wei, and Qin was Wei's close neighbor. The form of round money circulating in Wei must have had a huge impact due to Shang Yang's entry into Qin. Therefore, it was possible to mint one or two yuan of money after Shang Yang's reform. "Historical Records: The Chronicles of the First Emperor" records that "Wang Huiwen was established in the 19th year of his life, and money was issued at the beginning of the second year of his life." This refers to the official implementation of "half liang" money with square holes and rounded shapes. The currency of Qin is roughly one or two yuan, half a yuan, two sterling coins, twelve baht coins, half a tael, etc.