Archived documents refer to all kinds of paper documents and materials formed by archiving units in their functional activities and should be kept as documents and archives. These documents have been systematically sorted out, maintaining their organic connection and distinguishing their different values for the convenience of preservation and utilization. Archived documents are not limited to paper forms, but also include electronic documents, photos, audio-visual and other forms and carriers of archival materials. Filing is the process of binding, sorting, arranging, numbering, cataloging and packaging these documents in units of "pieces" to make them orderly. Archived documents should be bound one by one. When binding, the original is in the front and the final version is in the back; The text is in front, and the attachment is behind; The original is in the front and the copy is in the back; Forward the text in front, forward the text in the back; When communication and reply are regarded as a whole, reply comes first and communication comes last.