In the Tang Dynasty, Kaiyuan Bao Tong was used, but when the ruler first came to Chang 'an, everyone was still using the former currency. It was not until four years later that the trading system was changed to another currency name, and the unique coins of the Tang Dynasty appeared. Later, there were other Bao Tong, such as Xuanbao and so on.

Money characters on currency were written by celebrities at that time, which is the first time in history books that who wrote the fonts on currency. Thus, Kaiyuan Bao Tong was very important when the Tang Dynasty was just established. The four words written by eldest brother are strong in brushwork, moderate in typesetting, elegant and tangible, dignified and vigorous. In the first year in Tang Gaozong, the amount of money was very small, but the former money can no longer be used, and now it can be used very little, so after decades, people still barter things when they buy things.

Then something happened that changed the situation greatly. Two rebels forced the palace and made a new coin, which failed without much use. This is also of great historical value to coins that have not been used for a long time. In the later period, some ministers demanded the creation of new money. At that time, a new coin was equivalent to ten Kaiyuan Bao Tong. It seems that coins were made in Tang Daizong at that time. Although there are no books, they are circulated in kind.

In his fifth year as emperor, Tang Wuzong decided to let them make money with Buddha statues. So the monks were secularized, and the nuns returned to their original places and used the Buddha statues in the temples to make money. The last currency in the Tang Dynasty was similar to Gan Yuan Chongbao, which used official script, but the reverse side was smooth and nothing was written. It was used until the end of the Tang Dynasty.