《汉书·食货志下》:“秦兼天下,币为二等,黄金以溢为名,上币;铜钱质如周钱,文曰半两,重如其文。而珠玉龟贝银锡之属为器饰宝藏,不为币,然各随时而轻重无常”。师古注云:“上币者,二等之中黄金为上而钱为下也”。汉承秦制,只是黄金以斤易溢。即《史记·平準书·集解》引臣讃所云:“秦以一溢为一金,汉以一斤为一金。”不论《史记》、《汉书》或汉唐时的注家都很明确地指出,秦汉时黄金被法定为“上币”,从珠玉龟贝银锡 “Han food under the Chi”: “Qin and the world, the currency for the second class, the name of gold to spill, the currency; quality of the money such as the week money, the text said half two, as its text. The belongings are treasures, not coins, but at any moment of severity. Guru ancient note: ”On the money, the second highest among the gold and the money for the next.“ Han Cheng Qin system, but easy to overflow gold pounds. That is, ”Historical Records · Book of reference · Set solution“ cited by the minister Chen said: ”Qin Yi Yiyi as a gold, Han a pound for a gold.“ Regardless of ”Historical Records“, ”Han“ or Han and Tang Dynasties Note It is clear that the Qin and Han dynasties gold was statutory as ”on the currency", from Beads jade shell silver tin