We　propose　a　novel　contactless　measurement　technique　for　detecting　the　phasing　of　double　overhead　transmission　lines　which　are　used　to　supply　power　to　a　transformer　in　the　substation.　Different　from　traditional　contactless　methods　whose　sensors　should　be　quite　close　to　measured　overhead　lines,　the　proposed　method　uses　a　electric　fled　(EF)　sensor　located　on　the　ground　to　measure　the　ground　level　electric　field　distribution.　Then,　the　remote　contactless　phasing　test　method　can　be　realized　based　on　the　distribution　waveform.　The　proposed　method　has　been　validated　by　experimental　tests　on　a　reduced　scale　model　of　double　overhead　transmission　lines.