Mg-alloys as the lightest metallic structural materials have many excellent properties, but their corrosion resistance is poor. Thus the corrosion behavior of Mg-alloy in different service conditions need to be acquired. Especially, the composition of pollutants and meteorological factors in different atmospheric environments may affect the corrosion behavior of Mg-alloys. In this paper, the corrosion behavior of the extruded EW75 Mg-alloy in Shenyang industrial atmosphere was investigated by atmospheric exposure at Shenyang atmospheric test station located at 123°26' east and 41°46' north. After exposure for different durations, the test alloys were characterized by means of SEM, EDS and Raman spectroscopy in terms of their surface and cross sectional morphology and the chemical composition of corrosion products. The results show that the dusts containing soluble salts in the industrial atmosphere were deposited on the surface of the extruded EW75 Mg-alloy and form round-shaped corrosion products, which show good protection for the corresponding magnesium matrix; the potential difference between the fine precipitation phases and α-Mg is low, which exhibits weak micro-galvanic effect, resulting in the formation of uniform corrosion. In addition, the corrosion rate of Mg-alloys in Shenyang atmosphere is greatly influenced by seasonal variations. Compared with the low temperature and low humidity winter, the corrosion rate of the extruded EW75 Mg-alloy is significantly higher in the high temperature and high humidity summer.