It realizes digital management for the collection, sorting, identification, keeping, use, statistics, destroying, editing and studying of documents by using computer network technology, information technology, image processing technology, digital encryption, full-text search technology, compressed storage technology and other related technologies and treating scanned paper document images and collected and edited audio and visual documents, electronic and machine-readable documents and document directories as management objects and disk and CDs as backup storage mediums, realizing uniform document management and quick, secure and efficient queries through LAN, full-text search and document management.