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Currently,when magnesium alloy sheet is rolled,the method of controlling roll temperature is simple and inaccurate.Furthermore,roll temperature has a large influence on the quality of magnesium alloy sheet;therefore,a new model using circular fluid flow control roll temperature has been designed.A fluid heat transfer structure was designed,the heat transfer process model of the fluid heating roll was simplified,and the finite difference method was used to calculate the heat transfer process.Fluent software was used to simulate the fluid-solid coupling heat transfer,and both the trend and regularity of the temperature field in the heat transfer process were identified.The results show that the heating efficiency was much higher than traditional heating methods (when the fluid heat of the roll and temperature distribution of the roll surface was more uniform).Moreover,there was a bigger temperature difference between the input and the output,and after using reverse flow the temperature difference decreased.The axial and circumferential temperature distributions along the sheet were uniform.Both theoretical calculation results and numerical simulation results of the heat transfer between fluid and roll were compared.The error was 1.8％-12.3％,showing that the theoretical model can both forecast and regulate the temperature of the roll (for magnesium alloy sheets) in the rolling process.