Close the position directly with the main account number, and the sub-account number needs to correct the position; If a grandson account is used, the grandson account needs to modify the position in the case of direct liquidation or forced control of the sub-account. When modifying, select the sub-account number in the monitoring terminal, click Tools and Modify Position in the main menu, and then set the contract as liquidation contract, transaction direction, Kaiping as liquidation or liquidation, price as actual transaction price and quantity as liquidation, and click OK.