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Aim at the problem of poor retrieval quality in digital library, the advantage and correlative application of the ontology in digital librarypsilas semantics retrieval fields was introduced. Then basic structure of semantics retrieval system based on ontology was put forward, and the ontology of constructing scientific documents was presented. Further, the process of intelligent retrieval system based on the ontology was particularly presented. After a lot of practical argumentations, the paper concluded that semantics retrieval technology would improve retrieval quality extremely, and would be the preferred method to solving the lack of semantic relation in traditional retrieval technology.