The　single-phase-to-ground　fault　current　flows　between　flexible　interconnected　distribution　networks,　which　leads　to　the　expansion　of　fault　influence　range　and　the　reduction　of　loads　power　supply　reliability.　Flexible　multi-state　switch　(FMS)　was　used　to　realize　ground　fault　current　transfer　and　loads　transfer　simultaneously.　If　the　single-phase-to-ground　fault　occurs　in　both　interconnected　distribution　networks,　the　double　fault　clearing　can　be　achieved　by　using　the　two-way　fluidity　of　FMS.　According　to　the　theory　of　instantaneous　power,　in　the　dq0　coordinate　system,　the　output　components　of　the　d-　and　q-axis　of　FMS　can　be　controlled　to　realize　the　interaction　of　active　and　reactive　power　between　interconnected　distribution　networks.　The　flow　path　of　ground　fault　current　was　changed　flexibly　by　controlling　the　0-axis　output　component　of　FMS,　so　that　the　current　flowing　through　the　fault　location　is　zero,　and　the　fault　arc　suppression　can　be　realized.　By　using　the　relationship　of　mutual　decoupling　between　the　0-axis　component　and　the　dq-axis　component,　the　coordinated　control　of　ground　fault　current　transfer　and　power　interaction　can　be　realized,　which　not　only　suppresses　the　fault　arc,　but　also　ensures　the　power　supply　reliability　of　the　loads　affected　by　the　fault.　The　feasibility　and　effectiveness　of　the　proposed　method　have　been　verified　by　simulation.　©2022　Chin.Soc.for　Elec.Eng.