Tercopolymers were prepared by the condensation of 8­hydroxyquinoline (8-HQ), dithiooxamide (D) and formaldehyde (F) in the presence of hydrochloric acid (2M) as catalyst with varying molar ratio of reacting monomers. Tercopolymers were characterized by their electronic absorption spectra, NMR spectra, IR spectra, elemental analysis and TGA. Molecular weight of tercopolymer were determined by non-aqueous conductometric titration. The kinetic and thermodynamic parameters such as order of reaction, energy of activation, frequency factor, entropy charge, free energy change and apparent entropy change have been determined. Freeman Carroll and sharp Wentworth method have been applied for the calculation of kinetic parameters while the data from the Freeman-Carroll method have been used up to determine various thermodynamic parameters. The static (isothermal) TG data were analysed by use of Sharp-Wentworth method and Freeman-Carroll method. The activation energy of the tercopolymers were calculated and it was observed that the 8-HQDF-IV was more stable than those of 8-HQDF-I, 8­HQDF-II and 8-HQDF-III. This prediction on the basis of static TG data is an agreement with the prediction based on the activation energies and initial decomposition temperatures calculated from the dynamic TG curves.