Abstract:Transmission line is an important part of the safe and stable operation of power grid. In southern region, overhead line easily affected by natural icing, accidents of electric power that transmission line breaks, ice flashover, inverted tower were happened in the past. Therefore the natural icing of overhead lines in southern region has be a maintenance problem. In this paper, the practical application results of OPGW icing monitoring system are observed, then the system''s detection results and the data of natural icing were compared and analyzed. The analyzed results shows OPGW icing monitoring system is very effective.