Abstract: To unify the inter-organization service processes, a hybrid fragmentation method was presented for the dynamic service process model based on high-level Petri nets, i.e., global web services-business process execution language (WS-BPEL or BPEL) model was divided into several self-contained execution sub-chips which are assigned to different BPEL execution engines according to the difference between organizations for collaborative execution. Then, the correctness of the proposed method was verified with an instance given to illustrate the feasibility of the hybrid fragmentation method. A prototype system was thus given to support the hybrid fragmentation of the model. Simulation results showed that the execution of decentralized BPEL engines supported by the hybrid fragmentation method for dynamic service process is obviously superior to that of centralized BPEL engines, thus increasing the throughput of those engines with the cost involved in service response time reduced.