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The dynamic characteristic is one significant feature of modern workflow. In the dynamic workflow environment, workflow process is uncertain and can't be decided at once. In the workflow modeling stage, it is difficult to determine the task executors. Or executors should be assigned to the workflow task dynamically. So this paper does some research on dynamic workflow based on delegation authorization mechanism. Firstly, by analyzing workflow, the structure of dynamic workflow is given, the relationship between tasks and executors and the organization/user model are focused; Then, with studying on delegation of Authorization, formal descriptions on delegation relationship, delegation chain are provided, delegation condition, delegation constraint, delegation revocation are defined; At last, the two of delegation authorization mechanism and dynamic workflow are combined to solve the task users assignation problem, the delegation authorization structure in the dynamic workflow environment is presented, and the process of deciding task users and the algorithm of delegation authorization are shown.