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Business Process Modeling (BPM) is widely acknowledged as the specific technology to analyze and control workflow with flexibility and convenience. With the development of SOA theory and practical exploration, it is challenging for BPM to involve web services and to maintain complex interaction information. Since the lack of method to involve web service semantic in business process, we present the Semantic Event-driven Process Chains (SEPCs) that describe the business process of semantic web services composition. A function metamodel is defined to solve semantic inadequacy in a modeling phase and transforming phase. A mapping rule is defined to identify structure patterns and transform the SEPCs model into WS-BPEL business process model. The experiment takes purchase process of one shipbuilding company as an example to show the practical usability of the integrated modeling approach.