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Software architecture model play an important role in improving the quality of software products. A software architecture model is used for defining software. In this paper, an approach to modeling multi-level software architecture based on SOA is put forward. Firstly, four important properties of SOA are discussed. Secondly, based on Workflow-net, the formal definition of service is proposed. Finally, three rules to model composite service are introduced. The software model based on SOA lays the foundation for analyzing and reasoning it mathematically.