Trading limit refers to the limit on the number of futures contracts that each person can buy or sell every day in the futures market. The transaction limit of each credit card used by the cardholder shall be granted by the issuing bank according to the credit status of the cardholder. Business exceeding the trading limit can only be accepted by special merchants and business institutions authorized by the issuing bank. The trading limit of specialized banks is stipulated according to the transaction type and card type. In a sense, the transaction limit is actually the authorized limit of special merchants or commercial organizations, that is, credit card transactions exceeding the authorized limit must be authorized.