According to DoDAF enterprise architecture framework and taking the web service technology as an upper integration architecture and the midrange system as an underlying integration framework, the paper explores how to apply SOA to create a new modern management mode for the connected enterprise and the integrated architecture design methodology in order to break the interconnecting barriers between the enterprises and systems. Through the case study and investigation on the relationship between DoDAF 2.0 described Models of Service Viewpoint and System Viewpoint, we present a hierarchical architecture approach to integrated SOA of the connected enterprise, which demonstrates the advantages of the Midrange platform in enterprise SOA integrated architectures.