Abstract: This paper deals with the kinetic problem of the thermal decomposition of surface coordination compounds.Considering the different influence of various crystal planes,several surface Maderung constants of MgOwere computed,and the decomposition kinetics of H₂C₂O₄-MgOsystem was treated,as an accumulation of homogeneous surfaces For more complicated systems,according to the energetic heterogeneity on the surface,a kinetic equation has been proposed.where a denotes the degree of conversion,t the time,Athe frequency factor,Ethe initial activation energy,Rthe gas constant,Tthe temperature,n the reaction order,and C₁ and C₂ arc constants.The calculated results arc in agreement with those of experiments.