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Thermal degradation of polyester fabrics coated with interpenetrating polymer network (IPN) and silica fume (SF) was studied. Silica fume was modified with vinyltriethoxysilane (VTES) in order to improve its hydrophobicity and dispersibility in polymer matrix. Interpenetrating polymer network was prepared by sodium alginate (SA) mixed with 2-hydroxyethyl methacrylate (HEMA). Sodium alginate, HEMA, K2S2O8, N, N/-methylenebisacrylamide, N, N, N/, N/-tetramethylethylenediamine, and modified SF were mixed in aqueous solution with nonionic surfactant. In this condition, modified SF showed high dispersion ability in SA/HEMA solution. Additional, the application of 0.3 M CaCl2 onto PET surface and dried at temperature of 80o C for 1 hr was conducted. The result showed that the thermal property of modified PET fabric occurred at low temperature. This caused by the thermal degradation of alginate. Also, the content of SF increased the char formation of treated polyester fabric.