Abstract: Nowadays, we are facing with more and more emergencies. Emergency decision support system plays an important role in handling these events. Traditional model representation and management can’t fulfill the demands of model operation and management. This paper raises a formal-entity model representation based on the idea of knowledge elements. We introduce the concepts of model knowledge element and business knowledge element and classify models as the format model and entity model. This method can combine with emergency knowledge and support the unified model management in emergency decision support system very well