Our country first used brass to cast money in the Ming and Jiajing years. The word "brass" first appeared in the Western Shuo's Shenyi Jing, Zhonghuang Jing in the Western Han Dynasty: "There are palaces in the northwest, and brass is a wall, inscribing the palace of the emperor of the sun and the earth." This kind of "brass" refers to what kind of copper alloy, to be tested. The New Tang Dynasty Book of Food and Goods also has the names of "bronze" and "brass". Separation refers to ore color and smelting products, but in fact it is not the current copper-tin alloy and copper-zinc alloy. In Daye Fu written by Hong Zhikui of the Song Dynasty, "it is brass, pit has a special name and many mountains are simple", referring to pure copper made by pyrometallurgy. The term "brass" refers specifically to copper-zinc alloys, which began in the Ming Dynasty, and its records can be found in the Ming Huidian: "In the case of Jiajing, there are six million pieces of Tongbao Qian, which is applicable to 472,772 Jin of Erhuo brass...". Through the elucidation of the composition of copper coin in Ming Dynasty, the brass in the true sense of coin casting mentioned in Ming Huidian presented much later than the other copper alloys, because the metal zinc in brass was hard to obtain. Zinc oxide can be quickly restored to metallic zinc at high temperatures of 950 1000 while liquid zinc boils at 906 so that the restored metallic zinc exists as vapor. When cooling, the reaction is reversed, and the vapor zinc is oxidized to zinc oxide by carbon dioxide in the furnace. Therefore, in order to obtain zinc metal, special other condensation devices must be used. This is one of the reasons why the application of zinc metal is much later than that of copper, lead, tin and iron, and that of brass coins. However, there were brass sheets and brass tubes with zinc content over 20% unearthed in the Yangshao civilization relics of Jiangzhai, and two kinds of brass cones unearthed in the Longshan civilization strata of Sanli River in Shandong Jiao County. It is self-evident that the appearance of these brass objects does not mean that people have controlled the metallurgical techniques of brass in prehistoric times, but that they are unintentionally acquired in the application of copper-zinc symbiotic ores. In Shang and Zhou Dynasties, the zinc content of copper ware was very low, usually in the order of 10-z. In the money of the Western Han Dynasty and Xinmang Dynasty, there were copper and zinc sums made by board individuals, and the content of zinc in the money amounted to 7%. However, it could not be explained that the brass coinage took place in Xinmang of the Western Han Dynasty. Because these copper-zinc alloys are extremely individual symptoms, their zinc content is widespread and much smaller than that of brass in the true sense of 15% to 40%. Therefore, we think that these zinc-containing copper coins occurred in the Han Dynasty when copper-zinc symbiotic minerals were used in "Jishan Casting Money". According to the investigation of relevant mines, it is found that there are abundant copper-zinc symbiotic ores in Changwei, Yantai, Linyi and Hubei provinces of Shandong Province, which makes the smelted copper contain a small amount of zinc. In the Tang Dynasty, because of the standardization of money-making materials, the zinc content in the money was constant.