In order to further explore the heat-mass transport characteristics and reaction process inside the material bed during the roasting process of pellets, a heat-mass transfer model including static material bed and rolling material bed are established based on the law of heat-mass transfer, and the kinetic models of such physical and chemical phenomena as water evaporation, oxidation of magnetite and sulfur, decomposition of crystalline water and carbonate, and combustion of fixed carbon in the material beds are established. The results show that the heat-mass transfer model of the static material bed embedded with the reaction kinetic model can better simulate the roasting process of the static material bed in chain grate, ring cooler and belt roaster, and the one-dimensional heat transfer model of the rotary kiln embedded with the reaction kinetic model, material movement and combustion model can simulate the heat transfer process of the rolling material bed in the rotary kiln more realistically.