Voltage　flicker　is　a　common　interference　in　distribution　system.　The　limitation　and　detection　method　are　proposed　in　GB　12326-2000.　In　the　process　of　flicker　analysis,　much　work　focused　on　studying　the　voltage　wave,　computing　the　flicker　severity　and　developing　the　flickermeter.　The　location　of　flick-type　interference　source　is　an　emergent　problem　in　power　quality　domain.　Because　the　research　on　operating　character　of　flicker-type　interference　load　has　been　neglected,　there　isn＇t　any　applicable　method　of　locating　interference　source　in　engineering.　After　summarizing　the　detection　methods　of　interference　source,　several　qualitative　location　methods　and　their　feasibility　are　discussed.　Finally,　the　technical　base　and　key　point　of　interference　source　location　are　included　in　this　paper.