Decompression of second-hand houses refers to houses originally mortgaged to banks in the form of mortgage loans. After paying off the loan, the mortgage is lifted and the property right of the house truly belongs to you. After paying off the loan, you need to obtain the certificate of paying off the loan and the certificate of other rights issued by the bank. The mortgage borrower carries relevant documents to the local housing management department for cancellation of mortgage registration. Cancellation of mortgage means going to the Housing Authority to go through the mortgage cancellation procedures of other rights of the real estate license and get the real estate license back. Before buying and selling second-hand houses, if you are still in the repayment stage, you need to repay in advance, and the subsequent transaction process can only be handled after the ownership of the house is lifted. After the mortgage loan is paid off, the bank will show the settlement procedures within 1-3 working days, as well as the materials that need to be brought, including the current house purchase contract and loan contract. Usually, if the relevant materials are brought to the trading hall for mortgage cancellation, the mortgage registration will be cancelled immediately.