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为研究异步轧制搓轧区的几何参数，根据力平衡方程和秒流量相等的原则，建立了无张力条件下不同变形区组态的中性角和搓轧区比例计算模型，并按中性角取值对不同变形区组态进行划分。在三区组态的条件下，分析讨论了异速比、摩擦因数、轧件厚度和压下率对搓轧区比例的影响。搓轧区比例是决定异步轧制在降低轧制力、最小可轧厚度和得到细化组织工艺条件的重要参数，搓轧区比例计算模型的建立，为异步轧制工艺参数的设定提供了理论依据。中性角和搓轧区比例计算式经过试验验证，与实际值吻合。

The calculation formulas of geometric parameters,such as neutral angles and cross shear ratio in asymmetrical rolling were found. Different types of deformation region in asymmetrical rolling were distinguished by the values of neu-tral angles. The influences of speed ratio,friction coefficient,entry thickness and reduction ratio on the value of cross shear ratio were analyzed by the formula for cross shear ratio established in this study. The cross shear ratio is one of the most important parameters in asymmetrical rolling which determines the rolling force the asymmetrical rolling can reduce. The cross shear ratio can also influence the permissible minimum thickness and the micro-structure of rolled piece. The formula to calculate the cross shear ratio provides the theoretical foundation for the parameter optimization of asymmetri-cal rolling process.The results of rolling experiment proved that the formulae for calculating the neutral angles and cross shear ratio are consistent with the reality.