As a new type of software architecture, Service- Oriented Architecture (SOA) provides a blueprint to solve software reuse and enterprise system integration issues. With the emergence and the rapid development of Web Services technologies, SOA has been paid an increasing attention and gained a wide application. For the purpose of supporting service-oriented system development, SOA should be described at a high level of abstraction regardless of techniques involved in the application employment. In the context of the Supply- Chain Management System (SCMS), this paper puts forward a modeling framework for SOA, which regards service component as a first-class modeling entity. In virtue of the meta-modeling techniques, the meta-model of the SCMS is given to promise the interoperation between different systems. Furthermore, architecture specification in SCMS is given and we refine the model to manifest the practicability of our approach.