Abstract: Axis densities in normal direction inverse pole figure of surface in the pure ferrite steel were measured and calculated with different axis density calculation formulas, and according to the axis densities, the ferrite content in this steel was calculated, and then the ferrite contents calculated with different formulas are compared to judge the accuracy of each formula. The results indicated that the ferrite content in this steel got by Horta formula nears to 100%, so the adoption of this formula is the most reasonable.