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Integrating enterprise IT infrastructure and providing services to the public, SOA (Service Oriented Architecture) has been become the main stream in the field of IT domain. For example, Web Services as well as JMS (Java Message Service) are techniques commonly applied in SOA. In order to make sure that all services on the SOA platform are stably served, SOA Governance has become more important in terms of applying SOA to enterprise. But for various particular governance requirements, it is not an easy task to perform the role of governance well. This document will describe the basic concept of SOA, maturity model, and explore the enterprise solution of integrating applications and management of SOA. Then introduce how the evolution of CHT (Chunghwa Telecom) toward SOA Governance and the major functions of a practical governance system named SOBUS (Service Oriented Bus) which is developed by SOA Governance Evolution Project in CHT.