Abstract: The grounding performance of grounding device in transmission line is directly related to the stable operation of overhead collector line. Reducing the grounding resistance of pole tower is the main measure to reduce the lightning trip rate of line. This paper studies the drag reduction effect of graphite-based flexible drag reduction materials compared with other drag reduction materials in high altitude areas. Compared with the other two materials, it is concluded that graphite-based flexible drag reduction materials have more advantages in drag reduction in high altitude areas after a year's measurement of grounding resistance value of overhead line tower, which can provide reference for subsequent drag reduction transformation of power system.