The division iterative marching method on aerodynamic heating and structural heat transfer for the thermal environment of the cone body is presented. The flow field is calculated by the finite volume method. Spatial discretization scheme uses AUSM+. Explicit multi-step Runge-Kutta is used to calculate time iteration scheme. However, the structural heat transfer is calculated by the finite element method. Besides, the data exchange on the coupled wall is conducted by the interpolation method based on the virtual space. The verification example on the circular tube is analyzed, and the relative errors between the calculated values and corresponding test values for the heat flux and temperature of the stagnation point are 1.34% and 4.95% respectively at 2 s. Finally, the analysis on thermal environment of the straight biconic body is conducted. The initial wall heat flux is well matched with the experimental result, and the relative error between calculated value and experimental value at stagnation point is 3.1%. The temperature at the stagnation point increases with the time, and the upward trend slows down gradually. Finally it tends to the steady-state value. The time almost has no influence on the wall pressure, but the wall heat flux decreases with the increase of the time.