With　the　development　of　power　electronics　technology,　flexible　DC　distribution　system　is　getting　more　attention.　The　paper　introduces　the　development　of　the　flexible　DC　distribution　system,　and　analyzes　the　pole-to-ground　fault　of　the　double-ended　power　supply　system.　Then　it　uses　the　electromagnetic　transient　simulation　software　PSCAD/EMTDC　to　build　a　model　for　verification.　The　calculation　results　show　that　in　the　case　of　DC-side　clamped　resistance　grounding　method,　when　the　system　experiences　a　pole-to-ground　fault,　the　active　power　does　not　change.　©　2018　Association　for　Computing　Machinery.