With the institutional reform, merger and reorganization, and the adjustment of various government departments, all kinds of written materials have been basically filed and handed over to the archives over time. Real estate information 20 years ago can only be found in the archives of all districts and counties. All kinds of files, documents and materials are not kept by various departments for a long time, and electronic files are stored in the department archives room. All kinds of paper materials that have been born for a long time are handed over to the county archives for safekeeping according to regulations. If the housing authority where the house is located can't find the information, it can only be queried in its file.