Mortgage loan requires the borrower to provide a certain amount of collateral as the guarantee of the loan to ensure the repayment of the loan at maturity. Collateral is generally easy to preserve, wear and tear and sell, such as securities, bills, stocks, real estate and so on. After the loan expires, if the borrower fails to repay the loan on time, the bank has the right to auction the collateral and repay the loan with the proceeds from the auction.

Extended data mortgage is divided into maximum mortgage and traditional mortgage. Maximum mortgage means that the mortgagor and the mortgagee agree to use collateral to guarantee the creditor's rights that occur continuously in a certain period of time within the maximum amount of creditor's rights. It is a new mortgage system different from the traditional mortgage system. Compared with the traditional mortgage system, the difference lies in:

(1) The creditor's rights secured by the maximum mortgage amount are uncertain creditor's rights;

(2) The creditor's rights secured by the maximum mortgage are usually future creditor's rights;

(3) if there is a maximum mortgage, it must exceed the maximum payment;

(4) The maximum mortgage shall not be transferred with the transfer of the principal creditor's rights. Although the maximum mortgage is more independent than the traditional mortgage, it still belongs to the collateral, and its establishment mode and effect are not essentially different from the traditional mortgage.

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