In view of the aid to navigation effectiveness evaluation of offshore wind power plant, according to the selection principle of evaluation index, the evaluation index system with 27 three-level indexes is established. An evaluation model is constructed with Analytic Hierarchy Process (AHP) and Fuzzy Comprehensive Evaluation (FCE), and the evaluation flow is determined with Fuzzy Analytic Hierarchy Process (FAHP). Taken an offshore wind power plant as an example, the evaluation of aid to navigation effectiveness of offshore wind power plant is made. The results show that FAHP is of the characteristics of strong systematization, objectivity, and operability in the evaluation of aid to navigation effectiveness of offshore wind power plant.