Futures, also known as futures contract, is a standardized contract reached in the exchange, which is bound by law and stipulates that a specific commodity will be delivered at a specific place and time in the future. This contract stipulates the specifications, varieties, quality, weight, delivery month, delivery mode and transaction mode. There are similarities and essential differences between it and the contract, and the fundamental difference lies in whether it is standardized or not. We call the standardized "contract" "contract". The only variable of a contract is the price, which is generated by bidding in an organized futures exchange.