Offshore wind energy is one of the most attractive sources of renewable energy,however, the economics of offshore wind turbines especially foundations are currently challenges. Because of the difficulties met in conception design of offshore wind turbines foundations, a multi-level and multi-factor fuzzy optimization model has been used in lectotype optimization of foundations. In order to decrease the subjective influences, the multi-level fuzzy optimization has been introduced to cover most of the effect factors, and the prior relation method has been used to determine the membership grade in comprehensive optimization and weight. Considering various 13 factors of optimization objects and 4 design types of pile-style foundation, the method has been successfully used to an offshore wind farm for the lectotype optimization of pile-style foundations. The result shows that the new framework and methodology is scientific, reasonable and easy to use in lectotype optimization of offshore wind turbines foundations.