Abstract: In the large-scale business environment, a business process may involve lots of different web services arising from one or several enterprises. To handle those business processes efficiently, the architecture of a flexible workflow management system, i.e., e_ScopeWork is proposed on the basis of web service. The functions of its components are studied to analyze the features of task scheduling in workflow. As a result, the scheduling approach, deployment, and implementation mechanism of tasks or task managers are discussed in detail, thus attaining the goal that a workflow can be deployed flexibly according to the requirements and scale of a business process.