1. The balance of payments is often misunderstood, but in fact it is a record time period (usually one year) for all international transactions, reflecting the continuous purchase and payment activities between one country and all other countries. The central bank has repeatedly adjusted the deposit reserve ratio to control the money supply in the financial market. 3. In the past ten years, the country's current account and capital account have almost doubled. This resulted in a deficit of 20 12, that is, a large amount of hot money flowed out. 4. The function of foreign exchange market is to enable participants from different countries to obtain or provide vouchers for international trade transactions in convertible currencies, and to minimize the risks exposed by exchange rate changes. 5. Importers and exporters, international securities investors and multinational companies use the foreign exchange market for business or investment transactions. They mainly use market mechanisms to "hedge" foreign exchange risks.