Legal basis: Article 6 of the Provisions on the Filing Scope of Office Documents and Materials and the Preservation Period of Office Documents and Files is set as permanent and fixed. The term is generally divided into 30 years and 10 years. Article 7 The documents and archives for permanent storage mainly include: (1) documents and materials of laws and regulations formulated by this organ; (two) the main documents and materials formed by the important meetings and activities held by this organ; (three) important business documents and materials formed in the functional activities of this organ; (four) the organ's request for instructions on important issues and the approval and instructions of the higher authorities, important reports, summaries and comprehensive statistical statements; (five) the evolution of institutions, personnel appointment and dismissal and other documents; (six) housing sales, land acquisition, important contract agreements, asset registration and other documents; (seven) important documents and materials issued by the higher authorities and belonging to the business director of this organ; (eight) letters and requests from the organs at the same level and the organs at lower levels on important business issues, as well as their replies and replies.