In today's world, every country has foreign exchange reserves, which are just the amount. Foreign exchange reserve is a liquid asset held by the state to make up the balance of payments deficit, stabilize the exchange rate and ensure its external reputation. The United States has a relatively developed economy, high international reputation, strong overseas financing capacity (large borrowing reserve capacity), and less foreign exchange reserves. In addition to foreign exchange, it also includes ordinary drawing rights and special drawing rights.

Foreign exchange reserves refer to convertible foreign currencies held by a country's monetary authorities that can be used for external payment. Not all national currencies can be used as international reserve assets. Only those currencies that occupy an important position in the international monetary system and can be freely converted into other reserve assets can be used as international reserve assets. China and other countries in the world often use foreign exchange reserves in foreign trade and international settlement, mainly including US dollars, euros, Japanese yen, British pounds and so on.