Abstract: The desorption kinetics of CO₂ from the Cu/ZnO/Al₂ O₃ catalyst for the low temperature shift reaction is studied by temperature programmed desorption(TPD).The Tf method of analyzing the complex TPDspectra is put forward and a count problem about the surface coverage θ in the complex TPDspectra is solved.The detailed analysis of the complex TPDspectra,with the method of T₁ and desorption rate isotherms,gives the desorption kinetic parameters and determines the desorption rate equation.It is represented that the effective surface of the catalyst about CO₂ is not an ideal surface.And it is also found that the desorption of CO₂ from the catalyst is followed a first order process.The Arrhenius graph,lastly,is discussed.