According to the guarantee conditions of loans, loans can be divided into: ① credit loans, that is, loans issued by commercial banks only on the borrower's reputation without the borrower's guarantee; (2) Secured loan refers to a loan provided by the borrower or a third party according to law; (3) Bill discount is a special way of commercial bank loan, which is a loan issued by the bank at the request of the holder (customer) to buy the unexpired commercial paper held by the holder in cash.