Compression tests were done at temperature ranging from 250 to 450℃,strain-rate from 0.005 to 5 s-1 and the rolling tests were conducted. Combined with the modified peak strain model , peak stress model and quadratic equation and linear equation which were commonly used in mathematics, a new model of deformation resistance was established. Analyzing the rolling characteristics of magnesium plate, a geometric model in rolling deformation region was solved. Considering the factors of regional deformation spread and material characteristics, based on the principle of heat transfer and rolling theory, the rolling force model of different deformation areas and total rolling force model were established. The results showed that: The Sellars peak strain model after simplified of high precision was relatively simple in the form. The solution of peak stress model in reasonable temperature range improved the predicted accuracy effectively. The new model of resistance to deformation, not only had a easy form to apply to the actual production, but could accurately predict the deformation mechanism of a wide range of deformation under the conditions. Width elongation factors can not be ignored in rolling deformation zone and edge cracks and other defects were mainly produced in the backward slide area, so rolling force models should be established in the backward slide area and the forward slide area. Under different rolling conditions, the results of the model solution were consistent with the rolling tests of hot rolling process.