In this paper, we summarize the development and test for the Korean Smart Distribution Management System (KSDMS). To overcome the challenges faced by the Korean distribution automation system (KDAS), we propose three types solutions-real time, study and event-driven mode. For the architectural designs of KSDMS, we propose a communication system using the IEC 61850 and DNP3 protocols, feeder IEDs, and CIM-based middleware and server systems. We propose a database model that all KSDMS application programs will commonly use. The functions of FRTU and FIED are tested, and the test results of base platform are monitored through various HMIs. Through the integration test in Gochang power test center (PTC) between the base platform and the application program, we verify the performance of KSDMS.