In recent years, information management draws more and more attention. Various ERP systems have gradually emerged, and the development techniques of systems are becoming more flexible. With the increasing of complex business, there will be more demands on the flexibility, practicality and scalability of the system. In addition, especially for SMEs, management is more traditional, and it exits the shortcomings that the majority rely on previous management experience, have limited capital investment, and cannot have a dedicated IT personnel and so on, leading the usage patterns of the traditional software product beyond the capacity of SMEs. After analyzing the structure features of the service-oriented architecture (SOA) and Software as a Service (SaaS), the paper proposes ERP system based SOA. On this basis, the paper starts from the business process management (BPM), combines SOA and traditional enterprise service bus (ESB) to achieve the integration of ERP systems and combines SOA with SaaS to achieve the enterprise application of ERP systems for specific businesses.