Method and system for searching non-structural electronic document with obvious category classification

The invention provides a method and a system for searching a non-structural electronic document with obvious category classification. The method comprises a document classification and type keyword recognizing stage and a real-time searching stage; in the document classification and type keyword recognizing stage, document classification is used for classifying documents in specific collection according to a relation existing among content of the documents, and type keyword recognizing is used for recognizing keywords in all types; and in the real-time searching stage, the documents which are in accordance with a searching result are searched according to searching words input by a user and returning the searching result from high to low according to a document correlation, wherein a real-time searching correlation algorithm formula is provided by the real-time searching stage, the relation between searching words and document types is introduced in the real-time searching correlation algorithm formula, a TF-