Abstract: A comprehensive analysis of the rolling pressure model of a UCM cold tandem mill was carried out. The key sub-models that affect the rolling pressure model, such as static deformation resistance model, dynamic deformation resistance model, tension model and friction coefficient model, were studied in detail. By sampling the deformed steel plate between the machine frames in the rolling mill, the mechanical properties of the specimen were calculated by regression, and a set of deformation resistance parameters suitable for the production of extremely thin strip was obtained, and the calculation results were applied to the secondary system in the field. At the same time, according to the characteristics of extremely thin strip production, the tension of low speed section was increased and the lubrication ability of emulsion system was improved. From the results, it not only improves the precision of rolling force setting, but also reduces the rolling force, which solves the problem of frequent belt breaking in thin strip production.