1. If you have obtained the real estate license, then four copies are enough, one for yourself, two for the bank and one for the Housing Authority (Housing Registration Center); You can get a loan when you are finished.

2. If the house is an auction house, in addition to the above four copies, the real estate developer also needs one.

Housing mortgage loan is a kind of loan provided by the bank to ensure the safety of the loan. The borrower's real estate, securities and other documents can legally obtain the lien and pledge of the borrower's property through certain contracts. This kind of loan is actually a loan method in which the debtor (mortgagor) legally transfers the property ownership to the creditor (mortgagee) to obtain a loan. During this period, if the debtor fails to repay the loan principal and interest on schedule, the creditor has the right to dispose of the collateral and get priority compensation. This loan method can reduce the loan risk of creditors and provide the most effective guarantee for creditors to recover their loans. The use of mortgage loan in housing credit is based on the security, liquidity and profitability of bank operating funds. Because the borrowers of this kind of housing loan are mostly individual residents, and it is impossible for banks to clearly understand the financial strength and credibility of borrowers, which increases the risk of bank loans, and mortgage loans provide creditors with effective protection to recover loans just under the condition of high loan risk. Therefore, most banks use mortgage loans when granting housing loans to individual residents.

Reference: Baidu Encyclopedia-Housing Mortgage Loan