Proposed in this paper is a new comprehensive evaluation method of power quality based on self- organi-zing feature mapping (SOFM) networks,which is used to support the multi- level transactions of power quality infuture power market and the comprehensive management of power quality.The authors introduce the model andprinciple of SOFM networks,put forward an SOFM network model for the comprehensive evaluation of power quality,and make a comparison between the proposed evaluation method and several generally- used methods by using thesamples in literatures.The results show that the proposed method is suitable for the comprehensive evaluation ofpower quality and is of great practicability.