The main content of FKM guideline for assessing the fatigue strength was introduced, and the fatigue strength of anti-roll torsion bar was assessed by referencing FKM local stress approach, which was compared with Fe-safe. The result showed that: both of the evaluation results were consistent and the FKM guideline was more conservative, the fatigue strength of anti-roll torsion bar could meet the requirements. The fatigue damage degree of each stress component of the torsion bar obtained by the FKM guideline showed that the maximum fatigue damage of torsion bar was from the torsion bar shear stress, and the bending normal stress was the second one.