This paper reviews firstly the evaluation method of existing power quality indices

including the comprehensive evaluation of single and multiple indices of single monitoring point and the comprehensive evaluation method of single indices of multiple monitoring point at same voltage level. On this basis

a kind of comprehensive evaluation method of systematic multiple monitoring point and multiple indices including all voltage levels is proposed in this paper. The calculation and analysis result shows that the method is applicable to obtain comprehensive indies of power quality which is unified from such two aspects as time domain and spatial domain so to achieve comprehensive evaluation comparison of comprehensive indies of power quality of different areas.