The deficit in the settlement and sale of foreign exchange means that the amount of foreign exchange purchased by all customers is greater than the amount of foreign exchange settled by all customers, indicating that the market demand for foreign currency is greater than the market supply, and generally speaking, there will be depreciation pressure on the RMB. In China, the foreign exchange market can be divided into two levels. The low-level foreign exchange market is called the bank settlement and sale market, also known as the foreign exchange retail market, which refers to the foreign exchange trading market between non-bank enterprises, units or individuals and designated foreign exchange banks.