Secondly, mortgage loan is a way for large banks to refinance borrowers' houses. Borrowers can pledge all the paid-off housing mortgage loans to banks in order to obtain more mortgage loans. This kind of loan is called "secondary mortgage" because it is mortgaged again on the existing mortgaged house.

Compared with other loan methods, two mortgage has the following advantages: (1) You don't need to provide other financial proof, just apply on the basis of paying off the mortgage loan, and the application process is convenient; (2) The interest rate is low. For example, if the bank implements the national second-home loan interest rate implementation standard, the second-home loan interest rate will fluctuate with the current interest rate level, but it is generally relatively low; (3) Higher loan amount generally reaches 60%-80% of the property value.

Second, according to the person who applied for the loan

(1) Just-in-need crowd: two mortgage can provide financial support for new home buyers by withdrawing repayment funds from housing mortgage loans. (2) Entrepreneur: two mortgage is a more reliable short-term financing method for enterprises. If the enterprise has mortgaged the existing property, it can carry out the secondary mortgage operation, which can not only help the enterprise to alleviate the financial pressure in the short term, but also will not affect the long-term strategic layout of the enterprise. (3) Investors: two mortgage can also provide liquidity of mortgaged housing assets and provide funds for investments such as stocks and funds. However, when considering this use of two mortgage, we need to pay attention to the risk tolerance and the stability of asset mortgage.