Legal analysis: bank mortgage loan does not necessarily need a guarantor, but it is determined by bank loan. When handling mortgage loans, the lending bank will generally decide whether it needs a guarantor according to the borrower's credit conditions. When the borrower's credit conditions are insufficient, it needs a guarantor. The third party and the creditor agreed that when the debtor fails to perform the debt, the guarantor shall perform the debt or bear the responsibility as agreed. The third party here is the guarantor, including legal persons, other organizations or citizens who have the ability to pay off debts on their behalf.

Legal basis: Article 409 of the Civil Code of People's Republic of China (PRC), the mortgagee may give up the mortgage or the sequence of the mortgage. The mortgagee and the mortgagor may agree to change the mortgage order and the amount of secured creditor's rights. However, without the written consent of other mortgagees, the change of mortgage right shall not adversely affect other mortgagees.

If the debtor mortgages his own property, and the mortgagee waives or changes the mortgage, other guarantors shall be exempted from the guarantee liability within the scope of the mortgagee's loss of priority rights and interests, except that other guarantors promise to provide guarantee.