OTC market futures refer to futures trading in which the exchange is located outside Chinese mainland. Products in exchanges in the United States, Britain and other countries are usually traded futures contracts. Futures contract refers to the standardized contract formulated by the futures exchange, which stipulates that a certain number of subject matter will be delivered at a specific time and place in the future. Some American futures contracts, such as soybeans and copper, will have an impact on domestic futures prices. Domestic investors can refer to the external market.