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A new framework to do requirements practices is formed, according to the Meta-ontology, domain ontology, application ontology and their interrelationship, which can help to do enterprise modeling and even build up its knowledge-oriented intelligent model repository. The consistency between the process of acquiring application ontology for users and the test on model competency is also analyzed. The frame based on ontology has a logic foundation of predicates description, which facilitates the simulation of how to acquire the application ontology on enterprise domains with AI language of Prolog. The language has the ability of logic reasoning to find the faultiness of domain ontology and then makes it improved and perfect, which also is a try to evaluate and maintain the domain models.