Abstract: The paper studies the knowledge structure of conversion between the production analysis and relational mode. It includes the standard description of the meta-concept, the fact of engineering, design rules, and production activities. The representation method of knowledge frame is used to represent production concept and fact, and the service is used to represent the normal scheme of engineering. The domain ontology describes the basic concepts and relations among them, and defines the mapping relationship between logical concept and relational mode on the basis of above discussion. Considering the fact which considers production information as middle knowledge, it achieves conversion between the production fact and relational mode. It designs the knowledge structure for oilfield development.