The extreme sea lerel (maximum) includes storm tide and sea level rise due to climate change. Storm tide is defined by maximum of storm surge, slill waler height and wave setup. Climate change wiII make influence on storm characteristics and still water level therefore the extreme sea level wiII be changed. In marine engineering, the most common return period is varied from 50 to 100 years. For different important economic, social and historic structures it needs the return period about 500, 1000 years and more. For existing observed dala series, it is difficult to estimate the long return period required in future marine engineering application. The modeling system with numerical procedure could be applied for different marine and coastal region using local data base on the topographic, hydrologic and meteorologic conditions including storm and sea level observalions.