To investigate the effect of weld seam parameters between rim and spokes on the strength of a steel wheel, the finite element model including the seam is built for the steel wheel, and the effect of the parameters such as the fillet height between rim and spokes, the cross section shape of the seam and the weld seam position on the steel wheel stress is analyzed under bending load. The simulation results show that, as to this steel wheel, the fillet height between rim and spokes can be changed from the current 3.5 mm to 2.5 mm, which can provide some reference for the welding process parameter adjustment; the stress of weld seam is smaller when the boundary of weld seam cross section is straight; the stress of the welding area is smaller when the half of each weld seam faces towards the vent. The simulation and analysis can be used for the optimization on the weld seam structure between rim and spokes, and provide more accurate stress calculation results for the fatigue life estimation of steel wheel under bending load.