The five-baht coin was the unified currency during the reign of Emperor Wu of the Han Dynasty. The five-baht coin is the longest-used currency in the history of ancient Chinese coins. It is also a coin that uses weight as the currency unit. In the fifth year of Yuanshou, Emperor Wu of the Western Han Dynasty (118 BC), five-baht coins began to be issued in the Central Plains. Within four hundred years of the Western and Eastern Han Dynasties, five-baht coins dominated the world. The five-baht coin is a copper currency in ancient China. There are two seal characters of "五频" on the money, hence the name.

The central government established a special coin minting agency, in which the subordinate officials of Shuiheng Duwei (Zhong Guan, Bian Tong, and Ji Ji) were responsible for minting coins. Zhong Guan is responsible for casting, Bian Bian is responsible for examining the quality and fineness of copper, and skills are responsible for carving examples. The money with the word "五铢" on the face was first minted in the fifth year of Yuanshou (118 BC), the fifth year of Emperor Wu of the Han Dynasty. It is as important as its inscription and is called the five baht money.

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The "Yong'an Five Baht" did not play a positive role in the economic development of the Northern Wei Dynasty, but as a product of an era, it has collection value. According to historical records, there are three types of "Yong'an five baht" coins: one is the bare-back coin made by Emperor Xiaozhuang in the second year of Yong'an (529 AD); the second is the Yongxi period (532-534 AD) Emperor Xiaowu made money with the word "Tu" on the back; the third type was the money with four characters on the back made by Emperor Xiaojing of the Eastern Wei Dynasty in the third year of Xinghe (541 AD) after the split of the Northern Wei Dynasty.

The Five Baht of the Sui Dynasty was first cast in the first year of Kaihuang (AD 581) by Yang Jian, Emperor Wen of the Sui Dynasty. It is also called the "Five Baht of Kaihuang" or the "Five Baht of Set Samples". The seal script of the two characters "五铢" written on the money has neat strokes, wide edges and no good outline. There are vertical lines on the upper, lower and left ends of the word "五", and the back of the money has good outlines. The five baht in the Sui Dynasty was the end of my country's "two baht system".