Distribution　network　resonant　grounding　system　of　high　resistance　grounding　fault　handling　has　been　a　research　focus,　due　to　the　uncertainty　of　the　weak　fault　current,　fault　occurrence　time,　affected　by　the　circuit　parameters　and　random　factors　such　as　reason,　has　been　a　lack　of　reliable　high　resistance　grounding　fault　line　selection　method.According　to　the　fault　characteristics　of　single　phase　high　impedance　grounding　of　resonant　grounding　system,wavelet　packet　analysis　and　energy　entropy　are　combined　to　analyze　the　transient　zero　sequence　current,set　the　energy　entropy　be　the　transient　characteristic　of　single　phase　high　resistance　ground　fault,so　we　can　analyze　the　uncertainty　of　transient　fault　quantitatively.Analyzing　the　law　of　energy　entropy　distribution　of　zero　sequence　current　transient　signal,and　defining　the　mean　energy　entropy　is　to　calculate　the　complexity　of　signal　energy,then　proposing　a　fault　model　classification　method　based　on　average　energy　entropy.Single-phase　high　resistance　earth　fault　can　be　divided　into　2　fault　types,　and　according　to　the　different　fault　types,　using　different　algorithms　for　fault　line　selection,　finally　use　simulation　data　to　prove　the　correctness　and　feasibility　of　the　method.