Traditional　harmonic　responsibility　determination　methods　require　synchronous　measurement　data　of　harmonic　voltage　and　current,　which　limits　their　engineering　applications.　In　view　of　the　characteristics　of　existing　harmonic　monitoring　devices,　this　paper　proposes　a　method　to　determine　the　interval　of　multiple　harmonic　source　responsibility　based　on　the　statistical　harmonic　monitoring　data.　First,　considering　the　fluctuation　characteristics　of　harmonic　sources,　and　an　interval　responsibility　quantization　equation　is　established.　Secondly,　the　Skew-Normal　Mixture　of　Experts　clustering　algorithm　is　used　to　divide　the　harmonic　operation　scenario,　ensuring　that　the　fluctuation　of　harmonic　impedance　and　background　harmonic　voltage　remain　within　a　small　range　for　each　scenario.　Meanwhile,　the　parameters　of　interval　responsibility　quantization　equation　are　identified　utilizing　the　tolerance　approach,　and　then　the　interval　of　harmonic　responsibility　is　quantitatively　evaluated.　Finally,　the　feasibility　and　effectiveness　of　the　proposed　method　are　verified　through　simulation　examples.　©　2023　IEEE.