A　faulty　line　detection　method　based　on　the　high-frequency　components　of　zero-sequence　current　is　proposed.　It　applies　wavelet　packet　tools,　which　has　good　focusing　performance　in　high-frequency　space,　to　decompose　the　post-fault　transient　zero-sequence　currents　of　lines　to　pick　up　its　high-frequency　components　in　the　selected　frequency　bands,　and　calculates　the　sum　of　zero-sequence　current　high-frequency　components　of　both　faulty　line　and　healthy　lines　and　the　sum　of　their　currents　as　the　characteristic　information　of　faulty　system.　The　calculated　characteristic　eigenvalue　is　taken　as　the　main　criterion　and　the　fault　current　high　frequency　components　as　the　associate　criterion.　Simulative　experiments　show　that,　the　proposed　method　has　good　white-noise-proof　capability　and　high　faulty-line　detection　accuracy,　suitable　for　systems　of　different　grounding　types.