To achieve information integration,process integration and application integration of enterprise,an enterprise integration platform(EIP)based on service-oriented architecture(SOA)is built.The enterprise integration model depending on encapsulating the business processes as well as the enterprise applications by the neutral and standard web services is presented.The problem how to discover the existed enterprise resources and share them was resolved depending on the mechanism of publishing and discovering the services.The EIP is integrated closely with product lifecycle management(PLM)system so that the process integration as well as orchestration of the business process services is implemented by encapsulating the workflow engine of PLM system.Not only process integration and application integration,but also information integration based on the bill of material(BOM)conversion driven by process are achieved.Finally,an interpretive,qualitative case study on EIP is conducted for this research. To achieve information integration, process integration and application integration of enterprise, an enterprise integration platform (EIP) based on service-oriented architecture (SOA) is built. The enterprise integration model depending on encapsulating the business processes as well as the enterprise applications by the neutral and standard web services is presented. The problem how to discover the existed enterprise resources and share them was resolved depending on the mechanism of publishing and discovering the services. EIP is integrated closely with product lifecycle management (PLM) system so that the process integration as well as orchestration of the business process services is implemented by encapsulating the workflow engine of PLM system. Not only process integration and application integration, but also information integration based on the bill of material (BOM) conversion driven by process are achieved. Finally , an interpretive, qualitative case study on EIP is conducted for this rese arch.