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For the purpose of the description scope and verification capability faults existing in the policy semantic,a method to describe the semantic security policy based on ontology is presented.By defining the basic elements of the security policy,the relationship model between the ontology and the concept of security policy based on OWL is established,so as to construct the description framework of security policy semantic based on ontology.Through modeling in Protégé,the ontology model of authorization policy is reasoned and introducing first-order predicate description logic to the analysis and verification of it.Results show that the ontology-based semantic description of security policy has the better flexibility and practicality.