Korea launched national e-procurement systems in September 30, 2002. the adoption of the e-procurement systems in the central government of Korea has been acknowledged as successful. This paper presents a case study describing the public e-procurement systems of Korea, analyzing the development process, and finding factors for successful adoption of the systems. Government e-Procurement Systems (GePS) is a portal site providing information on public procurement and an application service provider of public procurement. GePS advances procurement service by reducing paper work and red tape, expanding the range of commodity selection, and standardizing services. Government-wide support including the President had a crucial role for the adoption of GePS. High capacity of information technology and institutional collaboration among public agencies were other foundations for the successful establishment of GePS.