Lending means that the borrower transfers the original loan to another financial institution in order to obtain lower interest rate or better repayment conditions. In the process of lending, if the borrower's original loan is a mortgage loan, then he needs to pay off the remaining mortgage principal and interest to the original lending institution before he can mortgage the property to the new lending institution. Because the mortgage loan takes the house as collateral, only when the borrower pays off the original mortgage can the house be mortgaged to a new lending institution and a new loan can be obtained.