OTC market futures refer to futures trading in which the exchange is located outside Chinese mainland. The products of American, British and London exchanges are usually 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. Large producers and traders can also hedge spot trading losses according to the external market.