The paper studies on the key technology for realizing the Semantic Expansion of Institutional repository based on linked data, taking the CASIR for example, the paper extracts the entity relationship of the CASIR and adds some constraints rules to it, uses the D2R to carry out the knowledge representation and semantic annotation as RDF format. Finally, It can expand the CASIR to DC、FOAF、ISWC、VCARD and so on. In fact, the method should lay a good foundation in accelerating the CASIR providing not only basic service but also a real semantic integration service with its rationality and feasibility in the future.
