Abstract: The electrokinetic potential polarization method, impedance spectroscopy technology, weight loss method and energy dispersive spectroscopy（EDS） were used to study the corrosion behavior of Q235 steel and galvanized steel in the simulated and actual atmospheric environments in Nanchang. The results show that in the Nanchang simulated fluid, with the extension of the immersion time, the impedance of the two materials first increases and then decreases. The average |Z|_0.05 value is used to compare the corrosion resistance of the grounding materials. The corrosion rate of Galvanized steel is much smaller than that of Q235 steel. During the 1a exposure period, the corrosion level of galvanized steel is C2, which is low, and the corrosion level of Q235 steel is C3, which is medium. The corrosion evaluations of Q235 steel and galvanized steel are relatively consistent in the two environments, and the simulated atmospheric environment can be used to study, analyze and compare the corrosion of typical engineering materials in power grid.