This paper studied the effect of corrosion damage on bearing properties of eccentric steel columns. Outdoor exposure salt spray accelerated corrosion tests of 7 H-type steel members were performed for 3 years at most, and then the material tests, of which the specimens were extracted from end region of the members, were conducted to investigate the relationship between the corrosion rate and the mechanical properties. Through the experiments of 2 non-corroded H-type columns and 7 corroded H-type columns, the experimental results show that the bearing capacity, stiffness and ductility ratio decrease with increasing corrosion degree, and the corresponding deflection increases. The stiffness and strain hardening effect are weakened by corrosion damage, which influences the plastic property and decreases the plastic adaption coefficient. The corroded compression-bending column models with the various sectional dimensions and lengths were calculated by using the validated fem simulation method, hereby, the deterioration law formulas of the bucking strength and the plastic adaption coefficient were established based on the corrosion mass loss ratio.