Aiming at the advantages of the six steady - state energy limit limits, the advantages of the fusion radar method and the membership algorithm, a method of evaluating the power quality of the improved radar and Gaussian membership function is proposed. Quality indicators into the form of reverse radar map to obtain a comprehensive index and then membership degree function classification. Each index corresponds to the part of the ring, the ring part of the angle is mainly affected by the size of the weight of the reverse radar map area and the circumference and then processed to be comprehensive evaluation of power quality indicators, and then a large number of data distribution as a comprehensive assessment And then use the Gaussian membership function to obtain the membership value of the comprehensive index in each interval, and find the interval of the maximum membership value, so as to carry out the comprehensive index classification. Compared with the previous comprehensive evaluation algorithm, this method not only puts forward the application of Gaussian membership function in the evaluation of power quality index, but also analyzes the failure index by means of graphic algorithm and provides the basis of comprehensive index classification. The method has the advantages of good feasibility.