Abstract: In order to further improve the anti-icing ability of the main grid frame of west-east power transmission, this paper introduces the icing conditions, types and hazards of transmission lines, analyzes the extreme meteorological conditions generated in southern China last winter and spring and the impact of icing on the inter-regional main grid frame of Guangdong, and focuses on the anti-icing and anti-icing situation of micro-meteorological and micro-terrain areas. In view of the existing problems, the improvement suggestions are put forward from the aspects of line fortification capacity in the design stage, ice covering prediction, monitoring and ice melting capacity in the operation and maintenance stage.