Abstract: This article analyzes the necessity of transformation, analysis of transformation technical measures, selection and analysis of conductor and ground, insulation coordination analysis, line body construction technology through the treatment of 500kV Qigui Yi line #43-#94 tension section and crossing railway safety hidden dangers Scheme analysis, analysis of technical schemes across high-speed railway construction, eliminate hidden safety hazards, reduce the impact of weak links in line operation and maintenance on the power grid, enable the safe and stable operation of the power grid, and effectively improve the reliability of power supply.