Kaiyuan Tongbao was the main currency in circulation during the reign of the Tang Dynasty for 290 years. It also affected the form of Chinese coins, the mode of coin writing and the decimal balance law for more than 1000 years. It has an epoch-making position in the history of Chinese coins. With proper currency control and exquisite workmanship, coins are very popular among the people. Kaiyuan Tongbao has become a part of the money of the Five Great Emperors. It has the function of eliminating evil spirits and prospering wealth.