The thermal decomposition of the complex of Schiff base containing S,N-Cd 3 [CH 3 O(O)C 6 H 3 CH = NNHC(S)NH 2 ] 4 .(CH 3 COO) 2 .1[CH 3 S(O)CH 3 ] . 2H 2 O and its non-isothermal kinetics have been studied by TG and DTG. The non-isothermal kinetic data were analyzed and the kinetic parameters for the first, second and third steps of the thermal decomposition were evaluated by two different methods - differential and integral methods - and tested by other methods. The most probable mechanism functions of the thermal decomposition reaction are: