Based on the theoretical analysis of the linear contact stress and deformation of the rollers of the roller linear guide, the contact stress distribution of rollers with different structures was studied. Numerical calculation and finite element simulation were used to compare the pressure singularity distribution of different roller ends under the same static load to optimize the roller structure design. The results show that the arc-modified roller structure can not only reduce the stress concentration, but also maintain the rigidity of the guide rail pair.The performance of LZ45 roller linear guide after optimization is better than that before optimization.