Marine meteorological and site specific conditions of offshore wind farms are closely related to the offshore wind turbine installations. With the special geographic environment of Taiwan, environmental extreme conditions as typhoon, wave/current, earthquake and weak sea bed conditions are crucial for the performance and structural integrity of offshore wind turbines. The focus of this technology is to establish an integrated dynamic load analysis and engineering design analysis for various bottom fixed underwater structure of offshore wind turbine under the extreme environment and geological conditions of domestic offshore wind farms and the proposed load calculation procedure can be useful for design, operation and maintenance of future domestic offshore wind farms.