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To indicate the dynamic characteristics of hypersonic aircraft gliding in the whole atmosphere, a calculation model of section stiffness considering thermal protection system(TPS) and ablation effects is proposed. Firstly, the section stiffness model with three-layer combination is put forward, which include the inside main backbone, the in-between original layer of TPS, and the outmost ablative layer of TPS. Secondly, based on the linear superposition principle, the calculation methods of each layer and total section stiffness parameters are given. At last, the analysis strategy of the hypersonic aircraft’s dynamic characteristics is given for actual use.