The approach of this project is how to construct the Ontology about Educational Resource (OntoER) with Web Ontology Language (OWL) released by W3C as technology standards and Technical Specification for Educational Resource Construction (TSERC) granted by National Ministry of Education (NME) as knowledge domain.The production about this approach would be of the technical core of Educational Resource Semantic Web.The technical bottle-neck about Next Generation Internet would be broken through with the approach.The dream would be realized for people to construct the Semantic Web on one knowledge domain.The mathematic tool of Description Logic has been introduced.The research objects as well as approach and conclusions have been formally presented