Abstract: Objective An approach for merging geo-ontologies using description logics is proposed.The first stepin this method is to find the concepts and roles between two given ontologies.Then,the equivalentconcepts between two ontologies are provided as a starting point.Second,by combining direct withtransitive reasoning methods,we used reasoners(Pellet and SPARQLDL Java API)to detect semanticrelations(equivalence,subsumption,overlap and disjunction)between the concepts and roles of twoontologies including concepts vs.concepts,roles vs.roles,concepts vs.roles.Third,the conceptsand roles in the resource ontology are gradually merged into the target ontology.Finally,experimentsare conducted by combining fundamental geographic information and land use data for China.The re-sults indicate that the proposed method is feasible and valid for merging geo-ontologies.