Korea Operational Oceanographic System (KOOS) is a research project funded by the Minister of Land, Transport and Maritime Affairs (MLTM) in Korea. The main objective of this project is to produce and give users the nowcast and forecast information which is needed to support ocean activities and to resolve various concerned problems. KORDI has been carrying out the KOOS program since August, 2009 and is supposed to finish its 1st stage until 2013. Presently the major efforts are focused on the setting and testing operational system with data management including information service.In strategical research plan, KOOS consists of three parts, 1) observing systems, 2) data analysis/management, numerical modeling, information service, and 3) practical applications.