Data model is the foundation of the intelligent Database Systems. The Research of intelligent Extension of Data Models is aiming at improving the performance and functions of database systems from the root of data models, so that they can handle knowledge objects, capture more semantics of the application, and have the ability of deduction. In this paper, an Object-Oriented Knowledge - Database Model is presented.The concepts and characteristics, definition and manipulation language frame and architecture of the experimental system OCEANS are discussed in detail.