There　are　subjectivity　and　uncertainty　in　the　general　comprehensive　evaluation　of　power　quality.　And　there　are　problems　of　randomness　and　ambiguity　in　the　boundary　of　power　quality　classification.　Firstly,　the　subjective　weight　is　obtained　based　on　the　cloud　model　theory.　Secondly,　the　objective　weight　is　obtained　based　on　the　improved　anti-entropy　method.　Thirdly,　the　subjective　and　objective　combined　weight　is　obtained　through　the　moment　estimation　theory.　And　then　the　final　score　of　each　observation　point　is　obtained　and　sorted　by　the　improved　TOPSIS.　Finally,　the　effectiveness　and　feasibility　of　the　method　are　verified　by　an　example,　which　provides　a　new　idea　for　the　effective　combination　assessment　of　power　quality.　©　2021　Institute　of　Physics　Publishing.　All　rights　reserved.