OWL is a language that depicts semantics of ontology. It does not only provide the strong semantic expression, but presents content that computer can be understandable. In the area of storage and managing mega data, the relevant techniques of relational database are natured. In this paper, the advantages of both are fully taken. It puts forward a storage model of relational database storing OWL ontology. This paper mainly gives design ideas and key interface technologies of the OWL Class storage model. Case studies show that classes that we design can effectively achieve data conversion relationship between the database and the OWL ontology Class.