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Electric system is a comprehensive system which is composed of several subsystems, as to achieve a massive data processing control platform which has high real-time, high reliability, power system can realize complex, dense, large range of access control under the jurisdiction of a number of subsystems, these requirements can be designed a reasonable and effective access control model. In order to put forward the traditional access control power system with cloud storage platform combining access control scheme of power system security, reliability and efficiency, through the cloud storage platform for access to data can reach a large amount of data, load balancing, safe and reliable; through adding credibility factors to construct the access control model, according to the feasible degree the calculation of different users value assigned to a different authority, its operational resources, to achieve a detailed user operation object recognition.