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The new computing modes, such as mobile computing, distributed computing, cloud computing and ubiquitous computing, etc., have brought about diversification and open features to the expression, exchange and access of computer network information. The multi-level security management is widely used in operation systems and information management systems. Focus on the multi-level security problem in various network environments, this paper defines the security identity, environment and temporal state of object, based on the ABAC (Action Based Access Control), and shows the security level, access scope and the demand of environment and temporal state of accessing subject, then proposes a multi-level security access control mechanism .Finally, an application example is given.
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