Futures short positions are passive from the customer's point of view, and they can only choose to make up positions or not to make up positions and be forced to close positions, because in this case, futures companies will generally add margin. If the customer doesn't make up the position, the futures company will reduce the position or even close the position on behalf of the customer. If after the relevant liquidation, the customer's deposit is not enough to make up for the loss on the futures contract, the futures company will recover the relevant arrears by fusing. If the customer does not pay and the amount is large, the futures company will recover the relevant arrears through legal channels.