Abstract: Firstly, this paper establishes a simplified model of the prismatic flexible aeroshell according to the requirements of the mechanical deployable reentry and entry technology. Secondly, based on the fluid-solid coupling analysis, the deformation of the flexible aeroshell under the aerodynamic action is obtained, as well as the deformation characteristics of the central depression. Lastly, the aeroshell model is modified according to the deformation characteristics, and the radial distribution of the aerodynamic force and heat and the variation of the aerodynamic heat against the reentry and entry time are analyzed again using the modified model. It is shown that the aerodynamic force and heat concentrations occur at the edge of the prismatic flexible aeroshell, and the variations of the aerodynamic heat environment in the whole reentry and entry process is basically consistent with those of a rigid rotary aeroshell. This research not only provides a basis for understanding the aerodynamic characteristics of the mechanical deployable reentry and entry technology, but also provides a reference for aerodynamic studies of other flexible aeroshells.