Abstract: Based on the bench strain test method, the stress state of the car wheel in the fatigue test is studied. The results show that the tire has a great influence on the load on the wheel during the radial fatigue test. The compression deformation and the clockwise and counterclockwise rotations of the tire and the drum will affect the stress state of the wheel. During the radial fatigue test of the wheel, the maximum load on the wheel occurs at the contact position of the wheel rim and the tire along the wheel circumference, and the load at the position near the wheel center is small. In the wheel bending fatigue test, the maximum load on the wheel appears at the position of the spoke near the wheel center, and the maximum strain is along the length of the spoke. Different loads have no effect on the variation rule of the wheel stress, but will have an impact on the maximum and minimum peak values.