In theory, the developer can sell the house to the outside world after obtaining the pre-sale certificate, and collect the house payment to apply for a bank mortgage. However, many developers will cash out from the bank in the form of mortgage of projects under construction in the early stage of development, so they can't apply for mortgage loans when they get the pre-sale certificate in the later stage, and they need to cancel the mortgage of projects under construction before they can apply for mortgage loans for buyers.

The word "Mortgage" is a cantonese transliteration of the English word "mortgage", which refers to obtaining bank loans with real assets such as real estate or securities and contracts as collateral, and repaying the principal and interest in installments according to the contract. After the loan is paid off, the bank returns the collateral. Mortgage means that the mortgagor takes the mortgage beneficiary of property right transfer as the repayment guarantee. After the mortgagor pays off the loan, the beneficiary immediately transfers the property rights involved to the mortgagor. In this process, the mortgagor enjoys the right to use the property.