BPR (Business Process Reengineering) theory puts its emphasis on ?gfundamental re-thinking and radically reengineering the enterprise business process"?C but neglects the continuous improvement, which make a lot of BPR projects result in failure. This paper analyzes the traditional BPR model, finds out factors that result in high failure rate of traditional BPR project and proposes the dynamical BPR model and a micro-kernel structure for the adaptive workflow management system model. The most important concept of dynamical BPR is changing the business process dynamically in the execution stage. It is implemented with the supporting of this workflow management system.