The　similarity　characteristics　of　transient　zero-sequence　currents　in　each　section　of　resonant　groun-ding　system　during　single-phase　grounding　fault　are　analyzed,　based　on　which,　a　grounding　fault　section　location　method　of　distribution　network　based　on　adAP(adaptive　Affinity　Propagation　clustering)　of　similarities　between　Hilbert　instantaneous　energy　spectra　is　proposed.　The　first　half　power　frequency　cycle　of　the　transient　zero-sequence　current　in　each　section　of　faulty　line　is　decomposed　into　waveforms　of　different　frequency　band　by　LCD(Local　Characteristic-scale　Decomposition).　The　Hilbert　transform　of　the　waveforms　of　different　frequency　band　is　carried　out　to　obtain　the　Hilbert　instantaneous　energy　spectra.　The　DTW(Dynamic　Time　Warping　distance)　between　every　two　of　Hilbert　instantaneous　energy　spectra　is　calculated　to　construct　the　similarity　matrix.　Then　the　matrix　is　clustered　by　adAP　algorithm,　and　the　fault　section　is　located　by　the　largest　Silhouette　index.　The　simulation　and　field　test　results　under　the　scenarios　of　arc　fault,　distributed　arc　suppression　coil　system,　different　compensation　of　arc　suppression　coil,　noise　interference,　two-point　groun-ding　and　asynchronous　sampling　show　that　the　proposed　method　can　accommodate　to　the　underlying　influen-cing　situations　in　engineering　application,　and　has　good　robustness　and　high　accuracy.　©　2021,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.