Abstract: The relationship between the thermal degradation process and the kinetic model of the modified coating was studied by using the grafted epoxy resin modified by nano-SiO₂ dioxide. In order to observe its structure and understand its working temperature, the effect of nano-filler with different contents on the thermal stability of epoxy resin was tested by using KH550 modified nano-filler. The thermal characteristic temperature during thermal degradation was analyzed by TGA and DTA, and the kinetic parameters and the model fitting methods were determined. The obtained kinetic parameters were used to model the degradation process. The results show that the obtained kinetic triad is used in the degradation model of nano-SiO₂/EP composites. It shows how much temperature affects the degradation time and degradation rate. The life span of the epoxy resin and the working temperature range of the nano-SiO₂/EP composite are found.