Abstract: Disclosed is a system and method for technical document analysis. The system comprises an internal database and a technical document analysis module. The technical document analysis module links with at least an original database, and may fetch the original data from the original database and analyzes the original data. The partial data of the original data with regularity and preliminary index act as primary identifiers. According to the relationship between the other part of the original data and the primary identifiers, the original data are converted into a plurality of sub-data. After being compared with the contents of the relationship database, the whole sub-data may be stored in the relationship database or only their renew portion may be stored in the internal database.