Abstract: Based on the investigation of ocean models, wave models, storm surge models and the current operational model systems, it is found that both the global model and the regional model have higher and higher resolution in ocean circulation model or wave model. The resolutions of theses wave models are improved in horizontal and spectral space, the grid interval of the global ocean model is less than 10 km and up to eddy resolution. According to the survey, the physical processes in the ocean, off shore and coastal zone have been re fi ned by assimilating ocean observational data and using the higher resolution model. And the hybrid coordinate in the oceanic circulation model has been adopted to understand the internal physical ocean processes in detail over different ocean regions. The unstructured grids in the ocean, wave and storm surge models have been used to describe the detailed topography over shallow water or coastal areas, then the detailed physical ocean process in coastal zone has been known. The current storm surge model is ocean-wave-tide coupled model system. In the future, the main trend of improvement in the operational ocean model system is going to develop atmosphere-ocean-wave-tide coupled model for better interpretation of the ocean physical processes.