Abstract: Based on macro plastic deformation, the differential method and integral method were presented in analyzing hot-strip-rolling. Theoretic formulas for calculating the rolling force and rolling torque were concisely educed according to those methods. The theoretic formulas have got rid of excessively experimental parameters adopted in the traditional formulas, rationally expounded the physical meanings of such variables as bite angle and neutral angle, and disclosed the relationship among the rolling variables such as rolling force, rolling torque, yield strength of metal and friction factor. Finally, a detail comparison between the calculated and measured data is made by experimental rolling, which has basically verified the correctness of the proposed formulas for hot-strip-rolling.