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According to the instance of workflow system, this paper proposed a role-based workflow authorization model which has level request. Compared to the traditional workflow access control model, mandatory access control idea is used for reference in this paperpsilas model, every user and privilege is given a security level. User can implement a task or not is impacted not only by the time or the context of environment, but also by the level relation between the user and authority. This model has been further strengthened the security of data object, and could be used in the field of financial or military that has the higher security requirements.