Abstract: In order to scientifically and accurately evaluate the power quality characteristics of ocean power generation,based on the traditional single index evaluation method,this paper proposes a comprehensive evaluation method of the radar chart,and improves the three aspects of expression,index empowerment and classification,which makes it more comprehensive,reasonable and intuitive to reflect the overall situation of power quality. Based on the field test data of wave energy convert,the overall power quality of the device is calculated and analyzed,and the result is unique. Compared with the evaluation results of the traditional radar chart method,the practicability and scientificity of the method are verified.