To adapt to the situation that a user could not complete the assigned task in time, a role-hierarchy-based task delegation model in workflow is proposed. In the model, tasks assigned to a role are seperated into delegatable private tasks and undelegatable private tasks as well as public tasks. Delegating user only need to limit the role scope of delegated user instead of determining a specific delegated user in a delegation application, and the delegation controller select a legal delegated user dynamicly according to role hierarchies in the limited role scope. In this model the delegating user can avoid the trouble of selecting a right delegated user.%针对工作流系统中用户由于某些原因不能按时完成所分配任务的情况,提出了基于角色层次的任务转授权模型.在该模型中,将系统指派给角色的任务分为可转授权私有任务、不可转授权私有任务和公有任务.委托用户在转授权申请中不指定具体的受托用户,只在下级角色中指定选择受托用户的角色范围,由转授权服务器依据角色层次关系动态选择合法的用户作为受托用户执行被转授权的任务,克服了以往转授权模型中由委托用户指定受托用户时受托用户选择不当或者多步转授权的缺点.
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