To solve the difficulty in establishing contact between the graphics element and the CIM objects in the graphics centric exchange approach， a graphics centric interoperation approach based on ontology is presented. It can enhance the horizontal association and semantic restriction of the electrical model; closely associate the graphics element and electrical model by building application ontology in each heterogeneous application. The graphics information sharing and interoperation can be converted to identification and mapping between one application ontology and another， so that multiple graphics display and information sharing can be effectively realized.