Abstract: The boundary effect has an influence on the accuracy of the numerical simulation of the thermodynamic environment of supersonic missile domes. In this paper, aiming at this problem, the numerical simulation models of missile domes are established and the flow field and structural temperature of missile domes are simulated by using the fluid-thermal-solid coupling partition algorithm method. A precise simulation calculation on the flow field and thermal environment of missile domes is thus realized, and the influence of the boundary effect on the thermodynamic environment of missile domes is analyzed. The results show that the boundary effect on the dome temperature environment decreases gradually as the boundary moves away from the dome stagnation point; distance from the boundary to the dome stagnation point has no correlative influence on the pressure field. The boundary effect should be considered in the thermal environment analysis, yet it can be neglected in the flow fluid analysis. This study is meaningful in predictive numerical simulation calculations of missile domes′ thermodynamic environment.