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Recently the technology of CBSD (component-based software development) and workflow become research focus, and they are important in software development. CBSD is a method of building system from down to up, which builds models for each subsystem ignoring the interaction among them, then composes all the subsystems to form the entire system. Workflow describes the relationship among business actions ignoring the details of business actions. Based on workflow technology and components technology, this paper focuses on a method using workflow based on roles and rules to compose components, and analyzes the details of all kinds of key elements such as roles assignment, rules builds and uses, and the method of using roles and rules in workflow.