For accurate ocean circulation forecasting such as elevation, currents and turbulence, the highresolution numerical model computations are needed. Also high-resolution numerical modelcomputations of conditions in the open ocean or on the coast, based on precise input data (including water depth) and using the latest schemes are needed.in this study, the setup methodology of model was improved and computational speed ofmodel was increased through revision and expansion of the numerical code for performanceenhancement namely related with parallelization routines and/or memory allocation and access. Sowe can calculate the large domain in a brief space of time. The domain of 300 m resolution forecasting system. It is divided into nine domain for the efficiency of operating,Though now is pilot phase of 300 m resolution of forecasting system, after the validation of it, weexpect that this system would be useful for fishermen, ship captains, and the KCG, who needaccurate prediction of currents.coast, based on precise input data (including water depth) and using the latest schemes are needed.in this study, the setup methodology of model was improved and computational speed ofmodel was increased through revision and expansion of the numerical code for performanceenhancement namely related with parallelization routines and/or memory allocation and access. Sowe can calculate the large domain in a brief space of time. The domain of 300 m resolution forecasting system. It is divided into nine domain for the efficiency of operating,Though now is pilot phase of 300 m resolution of forecasting system, after the validation of it, weexpect that this system would be useful for fishermen, ship captains, and the KCG, who needaccurate prediction of currents.