During rolling process, the geometry accuracy of roller wheel determined the forming accuracy of section. Design of roller wheel in each pass was primarily based on roller pattern of this pass, so the selection of bending angle in roller pattern became the key of the forming accuracy of section. In the process of rolling asymmetric section, the asymmetric deformation force of section leaded to defects such as section distortion in the forming section which caused quality issues. According to force analysis of roller pattern for asymmetric section, in the design of roller pattern for asymmetric section, the bending angle of long side can be determined empirically, and the bending angle of short side depends on the length ratio of the long and short sides as well as the bending angle of long side, which can effectively avoid defects such as section distortion. The modeling and simulation results of rolling an asymmetric section by using finite element software UGNX are consistent with the mechanical calculation results. In the process of rolling an asymmetric section, the roller wheel was designed according to above conclusion and applied to practical production, and the results were in good effect. The section quality completely met the design requirements, and the example was given to illustrate the validity of this conclusion.