The　uncertainty　of　renewable　energy　output　and　load　fluctuation　increases　the　uncertainty　of　power　system　operation　state,　for　which,　a　nonlinear　optimization　method　of　interval　power　flow　scenario　considering　the　correlation　of　interval　variables　is　proposed.　The　correlation　of　interval　variables　is　represented　by　constructing　uncertain　parallelogram　area.　Aiming　at　the　problem　of　repeated　calculation　caused　by　scenario　optimization　method,　the　state　variables　with　the　same　trend　are　classified　and　calculated　by　comparing　the　positive　and　negative　sensitivity　of　node　voltage　to　node　power.　The　results　of　example　analysis　show　that　the　proposed　method　can　accurately　calculate　the　interval　boundary,　effectively　reduce　the　optimization　times　and　improve　the　calculation　efficiency.　©　2022,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.