As the head of an aircraft, the blunted cone-flare undergoes thermal load, external pressure in supersonic
flow, and the stability are most important issues in the structural design. In the paper, the stability of thinwalled
structure is researched. First, the correction factor of FEM simulation is 0. 8, which is obtained by comparing
the FEM critical load and the test-corrected theoretical solutions. Then, the thermo-stability of composite blunted
cone-flare under thermal load and external pressure is analyzed by combining FEM and test, and considering the material
mechanical characters under different temperatures.