The Sogdian Merchants were the undertakers of international trade on the Land Silk Road in the Middle Ages, and their business footprints spread all over Eurasia. The ancient trading currency of Sogdian Merchants is a key to study the trading history of the region and the entire Silk Road. Although the economic strength of Sogdiana was strong, the country was very weak and had been controlled by the powerful forces around it. Sogdian Merchants wanted to use large amounts of currency for exchanging activities in countries along the Silk Road, they must imitate the currency of the powerful countries that controlled the Silk Road or even use their currencies directly to meet the needs of long-distance transshipment trade. Most scholars agreed that the Persian Sassanian silver coins used to be the currency of circulation along the Silk Road. Whether the main purpose of the unearthed Byzantine gold coins was to act as circulating currencies on the Silk Road at that time, there is still a great controversy.