Abstract: Atmospheric corrosion rates of carbon steel and low alloy steel were Predicted by using different models:two regressive models (D=ATⁿ,D=AT^Be^C/T), GM(l, l) model of "Gray system", and synthetic factors model of atmospheric corrosion. By comparing the calculated values with exposed test values, it indicated that same materials have different corrosion rules in different environments at the same time for different materials have different prediction models in the same environment.