The　bulk　dynamic　load　could　make　the　voltage　of　Point　of　Common　Coupling　(PCC)　fluctuate　and　results　in　flicker.　It　usually　transforms　in　power　grid　and　perhaps　exists　in　several　voltage　ranks.　In　order　to　mitigate　flicker　locally,　the　disturbance　source　location　is　desirably　solved.　Flickermeter　is　helpful　to　confirm　if　there　is　flicker　at　the　detecting　bus.　But　its　reading　indicates　the　accumulative　intensity　containing　upper　background　disturbance　and　down　load　disturbance.　It　can　not　point　out　whether　the　main　disturbance　source　results　from　upper　side　or　downside.　Supposing　that　only　one　load　is　feed　without　background　disturbance,　flicker　intensity　detected　at　PCC　can　represent　the　intensity　level　of　that　load.　A　responsibility　allocation　algorithm　derived　from　that　fact　is　proposed　in　this　paper.　It　tracks　the　impedance　of　loads　using　wavelet-transform　based　method　from　operating　data,　computes　the　virtual　voltage　of　PCC　according　to　the　percent　of　system　impedance　to　load　impedance　and　calculates　the　respective　flicker　intensity　for　each　interference　load.　The　flicker　intensity　corresponds　to　the　hazard　level　of　each　customer.　A　Real　Time　Digital　Simulation　(RTDS)　test　of　Flicker　Source　Location　System　(FSLS)　and　a　practical　application　in　Fujian　Grid　are　introduced　in　this　paper　too.　©2010　IEEE.