Abstract: The aerodynamic/thermal/structural coupling method was used to study the thermostatic aeroelastic problems of high-speed slender aircraft. In order to ensure the coupling accuracy and the ability to predict the thermo-aeroelastic characteristics, the aerodynamic and pneumatic heat were performed by CFD numerical simulation method. The thermal stress and thermal deformation were calculated by the finite element method and verified by the thermal evaluation test. Taking the simple slender aircraft model as the research object, the thermostatic aeroelastic characteristics were calculated and analyzed. Results show that the CFD/CSD coupling can simulate thermo-aeroelastic problems accurately, and the imbalamce of structural temperature rise caused by aerodynamic heating is the dominant factor of structural deformation. The deformation calculated by the force-thermal coupling is different from the simple force-analysis, and the influence law on the aerodynamic characteristics of the aircraft is different. Accurate prediction of the thermal aeroelastic characteristics of the aircraft is necessary for the structural design of the aircraft.