A transport bed calcination process applied to magnesite was systematically investigated through Aspen Plus process simulator.By connecting the external Fortran subroutine of magnesite decomposition kinetics,a pre-decomposition model of magnesite simultaneously considering gas-solid heat transfer(the fed magnesite preheated by the high-temperature calciner flue gas)and magnesite pre-decomposition reaction in the first-stage cyclone-type preheater was established(i.e.,gas-solid heat transferpre-decomposition model).Compared with the model considering gas-solid heat transfer without magnesite pre-decomposition first and then occurring the adiabatic pre-decomposition of magnesite(i.e.,solid adiabatic pre-decomposition model),the calculated result of pre-decomposition conversion based on the gas-solid heat transfer pre-decomposition model was greater,and the system had higher energy efficiency and lower energy consumption.Based on this model,the influence of calcination temperature and water content of magnesite on the light calcination process was further studied.It could be seen that with the increase of calcination temperature and water content of magnesite,the energy efficiency of the system gradually decreased and energy consumption rise.Especially,the water content of magnesite had a significant impact on the operability of the whole light calcination system.This paper provides guidance and reference for its industrial design as well as operation of light calcination process of magnesite.