the multiple exchange rate system means that there is not only one foreign exchange rate of a country's currency, but two or more exchange rates. Its purpose is to use the difference of exchange rate to restrict and encourage the import or export of goods. The complex exchange rate system varies from country to country, but the main principles are similar.

according to its manifestations, there are two kinds of complex exchange rate system: open and hidden. The open multiple exchange rate system means that the government clearly announces the different exchange rates applicable to different exchanges. There are many forms of hidden multiple exchange rate system. Give different or tax relief according to the category of goods.

secondly, the shadow exchange rate is adopted. Shadow exchange rate is actually a different conversion coefficient attached to different kinds of imported goods.