The functions of the futures clearing house are: (1) to ensure the trading performance; (2) Settlement of trading profits and losses. (3) Control market risks. Clearing members and their customers can hedge the contract at any time without obtaining the consent of the original counterparty; Clearing institutions guarantee performance, often through clearing members' deposits and "dynamic" monitoring. Item A is to perform the function of secured transactions. Item b is the function of clearing the gains and losses of transactions.