Yunnan, located in the southwest border area of Mainland China. The natives used cowry shells as a medium of exchange for a long time, but they actually did not use copper coins from the interior of China. Cowry shells were symbol of wealth and beautiful ornaments. Many native people viewed Cowry shells as an important media of divination and offerings. Relatively, copper coins didn't have diverse cultural meaning, so native people didn't accept its value extensively. This caused copper coins could not come into circulation smoothly. During the Ming Dynasty's last stage, the Yunnan area's Chinese localization or inlandization advanced. In addition, city culture became more prosperous, and consumer demand also increased. These transitions resulted in the gradual reduction of shell money being used in the Yunnan region as a medium of exchange. In many cities people monetary transactions had formed the custom of "the large number with silver, the decimal with the copper coins".