Corroded steel bars were obtained by accelerated corrosion with the applied electrical current，and the corrosion degree was determined by using three dimensional laser scanning technique. Mechanical properties of corroded steel bars were investigated by using the static and the high strain rate test system with strain rates ranging from 2×10-4s-1to 50.00s-1. The results show that all the corroded steel bars fail at the minimum cross section, and the yield plateau of steel bars shortens or even disappears with increasing corrosion degree. The relative yield load or ultimate load decreases linearly with increasing average corrosion degree, while the yield strength and the ultimate strength based on the minimum cross sectional area do not decrease. The relative ultimate strain obeys approximately the law of exponent degradation with increasing corrosion degree. It is also found that the mechanical properties of corroded steel bars are strain rate dependent. Both the yield and ultimate load increase as the strain rate increases, and the strain rate effect decreases with increasing corrosion degree, while the strain rate effects on elastic modulus and the ultimate strain are not significant.