The composite films of gelatin and gelatin/TGS were prepared successfully by using the solvent-casting technique with different composition ratios of the two materials (2, 4, 6, 8 and 10 wt%TGS). Films exhibited similar X-ray diffraction (XRD) patterns, showing a displacement in position of the gelatin characteristic peaks. Thermal characterization was used to characterize the obtained films. Helix-coil transition and glass transition temperature were measured by differential scanning calorimetry (DSC). There is interaction between gelatin and TGS through hydrogen bond formation. Thermogravimetric analysis (TGA) was used to characterize the thermal stability of the composite films. The kinetic parameters such as activation energy, entropy, enthalpy and free energy for all the investigated samples were determined using Coats-Redfern and Horowitz-Metzger equations.