Abstract: There are many factors that cause fluctuations of the deformation zone temperature in warm rolling process of AZ31 magnesium alloy strip. Therefore， the accurate prediction of the deformation zone temperature is the key to guarantee the product quality in warm rolling process. The deformation zone temperature of AZ31 magnesium alloy in warm rolling process was simulated by using finite element method . The physical parameters of rollers and strips were given together with the initial and boundary conditions of simulation. The results demonstrated that the five key factors affecting deformation zone temperature are identified as roller temperature， rolled-piece temperature， rolled-piece thickness， rolling speed and reduction ratio. The simulation data were obtained by orthogonal experimental simulation method， the regression model of the deformation zone temperature was gotten. Finally the mathematical model accuracy was detected through a group of simulation data.

Key words: AZ31, warm rolling process, simulation, deformation zone temperature, mathematical model