In this paper, the DSC and TGA for phenol and silica/phenolic composite were carried out by increasing temperature up to 950℃ with variable heating rate, to figure out basic thermal and pyrolysis characteristics of the composite. Also, the aim was to obtain the activation energy and the frequency factor which are the main parameters of the Arrhenius equation based on the Kissinger theory. The activation energy and frequency factor were used for the ablation model as material property. To confirm surface temperature distribution and recession of missiles, the CFD analysis using ANSYS Fluent R18.2 was performed to examine the thermal fluid characteristics of the hypersonic flight environment. Subsequently, the analysis results were applied as boundary conditions to a 2D axisymmetric pyrolysis and ablation model. Finally, pyrolysis and ablation analysis were performed using the ablation analysis code SAMCEF AMARYLLIS V.17, which uses the specific ablation module based on finite element code by applying carbon/phenolic and cork materials up to t = 10 s.