Tellus 12 foreign exchange platform came into being with international trade, and foreign exchange trading is a tool for international settlement of creditor's rights and debts. However, in recent ten years, foreign exchange transactions have not only multiplied in quantity, but also undergone major changes in essence. Foreign exchange trading is not only a tool of international trade, but also the most important financial commodity in the world. With the change of the nature of foreign exchange transactions, the types of foreign exchange transactions are increasingly diversified. Foreign exchange transactions can be mainly divided into cash, spot, contract spot, foreign exchange, options and forward transactions.

(1) Cash transaction

Cash transactions are transactions between tourists and people who need foreign exchange cash for other purposes, including cash and foreign exchange traveler's checks.

(2) Spot foreign exchange transactions (firm trading)

Spot trading is a transaction between big banks, and it is also a transaction between big banks acting as agents for big customers. After the transaction is concluded, the payment and delivery of funds shall be completed within two working days at the latest.

This paper mainly introduces the personal foreign exchange transactions launched by domestic banks for individuals and suitable for the participation of mass investors. Personal foreign exchange trading, also known as foreign exchange treasure, refers to the trading behavior of individuals entrusting banks to buy and sell one foreign currency into another with reference to the real-time exchange rate in the international foreign exchange market. Because investors must hold enough foreign currency to trade, the internationally popular foreign exchange margin trading lacks the short selling mechanism and financing leverage mechanism of margin trading, so it is also called firm trading.

(3) spot foreign exchange trading of contracts (margin trading)

Contract spot foreign exchange trading, also known as foreign exchange margin trading, margin trading and virtual trading, means that investors and financial companies (banks, dealers or brokers) specializing in foreign exchange trading pay a certain percentage of trading margin (generally not exceeding 10%) by signing contracts to buy and sell foreign exchange on behalf of customers, and buy and sell foreign exchange of 654.38 million, hundreds of thousands or even millions of dollars according to a certain financing multiple. Therefore, this kind of contract transaction only makes a written or verbal commitment to a certain price of a certain foreign exchange, and then waits for the price to rise or fall before settling the transaction, so as to gain profits from the changing price difference and of course bear the risk of loss. Because this kind of investment needs funds more or less, it has attracted many investors to participate in recent years.

(4) Futures trading

Foreign exchange transactions are conducted at the agreed time and the established exchange rate, and the amount of each contract is fixed;

(5) Option trading

Option trading is an option to trade in advance whether to buy or sell a certain currency in the future;

(6) Forward transactions

Forward transactions are delivered on the date agreed in the contract, and the contract can be large or small, and the delivery period is flexible.