Abstract: In order to improve the accuracy and overall rate of information retrieval, on the basis of studying the relevant technologies about ontology constructing and semantic retrieval, ontology and semantic are applied to education resources retrieval field. Based on the ontology of user input query keywords query expansion, the use of Lucene for the expansion of keywords search, an education resources semantic retrieval system is designed and implemented. The comprehensive recall rate of the retrieval model is 81.5% , and the comprehensive precision is 83.1% . The two indexes are all superior to the traditional
keyword seardh methods.

Key words: query expansion, semantic retrieval, education resources, ontology