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To solve some common problems in a distributed and dynamic environment, a high-adaptive distributed workflow system is introduced in this paper, which is based on MVC structure and mediator model. In the implementation, the system automatically carries on the duty assignment or the duty adjustment to this engine when an engine was moved into or transferred out. Meanwhile, two granularities, both process and activity instead of process, which the process of scheduling of tasks takes, can bring greater flexibility. Through the mechanism described above, we can improve the system adaptability to the running environment to achieve greater efficiency.