Personal customers are not allowed to make physical delivery at present. Generally, they should close their positions (or be forced to close their positions) before the contract enters the delivery month. The positions of corporate customers will gradually increase (generally to 30% of the contract value). If the expired contract is not delivered, it will be regarded as a breach of contract, and the exchange will auction the customer's position list, and the auction loss will be borne by the customer. If the auction fails, the exchange will impose a penalty on the customer, which is about 20% of the contract value.