Ontology-based semantic information integration can resolve the schematic semantic heterogeneity among dis-tributed data sources but can not resolve the context heterogeneity. This situation leads to the semantics of results returned from the information integration system is still unclear. To this deficiency the context representation and inference mecha-nism is introduced to existed semantic information integration system to extent the capable of resolving semantic heterogene-ity. In the extended system, the context heterogeneity can be detected and resolved automaticl...