Buyers can find the relevant real estate department to check the relevant file information. Generally, the files of houses sold or mortgaged can be found in the real estate department, so you only need to bring the relevant documents to the real estate department. The department can then check whether a mortgage has been set on their house. In addition, you should read the property ownership certificate clearly when signing a contract for buying a house. Generally, for houses without mortgage, the "Other Rights" column of the real estate certificate (that is, the owner's name, address, area, etc.) column is empty. If the house is mortgaged, it will be listed on the real estate certificate. record. Therefore, you can know whether the house is mortgaged by checking whether it is registered in the "other rights" column of the real estate certificate.