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Semantics comprehension is the key for intelligent decision making. Semantic based interaction is the method of model management in decision support system. A semantic driven interaction method is presented for DSS. Two ontologies are defined to provide semantics, according to the characteristics of knowledge of model. Modelpsilas semantics are defined as model description semantics and model action semantics. Models can interact under a three-layer interaction framework. Control mediator in framework can detect potential collisions through a multiple layer recursive matching algorithm. A negotiation algorithm is proposed to make the interaction based on semantics extracted from ontology level and semantic level.