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In hot roiling of large ring,the ratio of rolls radii R1/R2,i.e.the ratio of the radius of the driver roll R1 to that of the idle roll R2,has a significant effect on the geometric shape of the deformation zone of the ring.The latter plays a decisive role in achieving large ring products withgood quality.An analytical description of the geometric shape of the deformation zone is presented,followed by a quantitative determination of the relationship between the geometric shape of the deformation zone and R1/R2 A valid and complete 3D coupled thermal-mechanical FE model of the process is developed in the dynamic explicit code ABAQUS、Explicit.In hot rolling of a large ring product with an outer diameter of approximately 1.3 m,an investigation is conducted regarding the effect of R1/R2 on the process by using FE simulation,and the results show the following:(1)With the decrease of R1、R2,relative spread,strain and temperature distributions of the ring tend to become uniform and then become nonuniform.(2)There exists an optimized range of R1、R2,i.e.[1.5-1.8],within which large ring products with better end-plane quality and more uniform strain and temperature distributions can be obtained.The achievements can serve as a guide to the design and optimization of rolls for the practice of relevant processes,and can provide a significant basis for the further study on hot radial-axial rolling of large ring.