The form of foreign exchange refers to the method of foreign exchange. There are three key forms of foreign exchange.
（1） Free exchange for foreign currency
Foreign currency includes foreign currency cash and foreign currency savings. At present, the key global exchange currencies are US dollar, Europe, Japan pillar, euro, Swiss franc, Canadian dollar, Australian dollar, Singapore dollar, Hong Kong dollar, etc. Among them, the U . with the rise of Europe, the layout of the metallographic rival between Europe and the United States will be gradually improved. Maybe the second-class international monetary system will be ushered in according to the United States dollar and Europe
（2） Payment credentials expressed in foreign currency at will
The key to foreign currency payment credentials are bills of exchange, promissory notes, bank bills and payment appointment documents. The bill is divided into commercial acceptance bill and bank acceptance bill, in which commercial acceptance bill is an unconditional payment order given by the export company (debtor) to stipulate that the buyer (borrower) pays a certain amount of foreign currency; Bank acceptance bill is an unconditional payment order approved by a country's financial institution to its foreign affiliates or agents. Bank draft is an unconditional payment order for the foreign currency deposit of a financial institution to be approved by the financial institution by the customer, which requires the financial institution to unconditionally pay to the beneficiary or holder of the bank draft. Promissory note is an unconditional payment service commitment that the drawer (financial institution) promises to pay a certain amount to the recipient or the bearer of the promissory note at a certain time in the future. The letter of appointment for payment is the certificate issued by financial institutions to its foreign affiliates or agents, which authorizes it to pay certain amount in foreign currency to a specific recipient.
（3） Exchange of securities expressed in foreign currency at will
Foreign currency securities refer to the use right credentials and bond volume credentials with the face value of exchange loan currency, including foreign currency shares and foreign currency securities detection. Foreign currency securities can be freely exchanged for foreign currency or foreign currency payment credentials in the secondary market, which has strong liquidity. Therefore, it is a kind of foreign exchange existence form. In addition, foreign currency securities can also generate dividend distribution and debt and interest income, which are the key ways for investors and government departments to store foreign exchange property in the world.