: The atmospheric corrosion behavior of Q235 steel used as the transmission tower material was investigated systematically in the 10 representative transmission lines of four typical atmospheric environments ( urban，industrial，marine and rural) by field exposure in Guangdong Province for one year． The period for recapturing samples from the field station lasted 6 and 12 months respectively． Their corrosion weight losses in unit area were measured to investigate the corrosion rule of Q235 steel． X-ray diffraction ( XＲD) and scanning electron microscopy ( SEM) were applied to analyze the microstructure and morphology of the corrosion products respectively． Ｒesults suggested that the atmospheric corrosion grade of a large part of Guangdong Province belongs to C3 and other parts belong to C2，a moderate rank as a whole． The influence of different environments on the atmospheric corrosion is different as follows: the heavy industrial environment，the compound one of marine and light industry，the marine and urban one，the little city and rural one． The corrosion rate of Q235 in the previous 6 months is obviously higher than that in the latter stage from 6 to 12 months in one-year-field exposure． The corrosion products are mainly αFeOOH and γ-FeOOH with net-or needle-like micro morphology，and a small amount of β-FeOOH is observed in the marine environment