Legal analysis: After the last principal is paid off, you should go to your loan bank for early settlement, and then take the settlement voucher, the last repayment form, provident fund loan contract, ID card, invoice of guarantee fee, the original ID card of the borrower and other materials to go to the branch of Shanghai Housing Property Guarantee Company corresponding to the loan bank for settlement of guarantee fee, ask the guarantee company for materials for mortgage cancellation, and then take his right certificate (commonly known as mortgage certificate) to go to the real estate trading center for mortgage cancellation.

Legal basis: Article 392 of the Civil Code of People's Republic of China (PRC). Where the secured creditor's right has both things and people guarantee it, if the debtor fails to perform the due debt or the parties agree to realize the security interest, the creditor shall realize the creditor's right in accordance with the agreement. If there is no agreement or the agreement is unclear, and the debtor provides the security of the property himself, the creditor shall give priority to the realization of the creditor's right with respect to the security of the property; Where a third party provides a property guarantee, the creditor may realize the creditor's right with respect to the property guarantee, or may require the guarantor to assume the guarantee responsibility. The third party providing the guarantee shall have the right to recover from the debtor after assuming the guarantee responsibility.