The　pollution　of　the　common　connection　point　(CCP)　in　the　power　grid　is　the　result　of　the　interaction　of　multiple　harmonic　sources.　In　order　to　more　accurately　and　fairly　divide　the　harmonic　responsibility　and　harmonic　influence　of　each　harmonic　source　at　the　CCP,　a　comprehensive　evaluation　method　considering　the　user’s　harmonic　tolerance　and　grid　loss　is　proposed.　Through　power　flow　calculation　and　correlation　analysis,　the　influence　degree　of　multi-harmonic　sources　on　the　common　connection　point　is　divided.　Considering　the　degree　of　harmonic　tolerance　of　general　users　on　the　user　side　and　the　network　loss　factors　on　the　grid　side,　the　multi-harmonic　source　access　distribution　network　is　comprehensively　evaluated.　Combined　with　the　power　flow　calculation　results　and　the　harmonic　compatibility　level　of　the　distribution　network,　a　comprehensive　evaluation　index　is　formulated.　This　method　can　objectively　evaluate　the　influence　degree　of　the　harmonic　source　on　the　distribution　network,　and　has　certain　guiding　significance　for　the　location　selection　of　the　harmonic　source　access　to　the　distribution　network,　the　harmonic　responsibility　allocation　of　the　multi-harmonic　source　access　to　the　distribution　network,　and　the　subsequent　harmonic　control.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Switzerland　AG　2024.