Legal basis: Notice on Forwarding the Provisions of the State Archives Bureau on the Filing Scope of Office Documents and Materials and the Retention Period of Office Documents. After the collection, arrangement and implementation of the new intransitive verbs, the existing "filing seal" will not be replaced, and the preservation period is 30 years, which means long term, and 10 year means short term. The document numbering method is as follows: according to the order of filing documents, an office is permanent every year, 30.