Abstract
Service Oriented Computing is being widely accepted as an effective paradigm for developing applications by using already developed services. Services can be developed by different developers and be subscribed by different service consumers. Because of the loosely coupled nature, Service-based applications can be typically highly dynamic and unstable. That means services can be moved, deleted, and are subject to faults. However, it is hard for service consumers and service providers to address these faults in their own method. In this paper, we define roles of service broker within interactions between service consumers and service providers and propose a method to improve fault tolerance by using fault tolerant natures in reliable manager. Based on this, services can be dynamically selected; therefore, we can achieve good service reliability.