Based on the large project analysis software MSC.Marc, a 3D finite element model was designed to simulate the rolling process of Fi stand. Simulation of the strip's steering state was done under asymmetrical variations and the high temperature constitutive equations of 1235 aluminum were obtained from experiments. The asymmetry of the rolling force, strip trajectory and other rolling parameters were studied under asymmetric distribution of incoming thickness, asymmetric shape of rolling gap and incoming un-centering. Then the relevance between the strip steering and the horizontal distribution of rolling parameters, such as the rolling force and the reduction rate, was discussed. The result has shown that the relationship between the strip steering direction under various disturbances and the difference on both sides of rolling force cannot determine the steering direction of the strip according to the difference under the rolling force. The difference of reduction rate is consistent with the steering direction, and strip steering is always from the larger reduction rate side to the smaller side. This result provides a theoretical reference for strip correcting strategies when the variations are uncertain.