The Enterprise Service Bus (ESB) is the infrastructure for the implementing of SOA (Service Oriented Architecture). The existing enterprise service bus has a serious decline in the performance in a high-concurrent situation. To address this issue, this paper analyses the principles of SEDA (Staged Event-Driven Architecture) model and the ESB functional requirements. The SEDA model is applied to the design of ESB, and a SEDA-based Enterprise Service bus is designed and implemented. According to the test and the analysis of the SEDA-based ESB, the SEDA-based ESB performs better in the case of high-concurrency.