(1) After signing the contract, both parties do not need to pay foreign exchange or domestic currency immediately, but postpone it to some future time;

(2) The transaction scale is large;

(3) The main purpose of trading is to preserve value and avoid the risk of exchange rate fluctuation;

(4) Contracts signed by foreign exchange banks and customers must be guaranteed by foreign exchange brokers. In addition, customers should also deposit a certain amount of margin or collateral. When the exchange rate changes little, banks can use deposits or collateral to make up for losses. When the exchange rate changes cause the customer to lose more than the deposit or collateral, the bank shall notify the customer to add the deposit or collateral, otherwise the contract will be invalid. Deposits deposited by customers are regarded as deposits by banks and bear interest.