We construct a solid-flow coupled model of a blunt-nose front-window flight vehicle. Through this model, we analyze the propagation characteristics of the target light ray and the resulting imaging deviation under the combined effect of the flow field and the optical dome. The results show that the target light is deflected near the normal direction after entering the aero-optical flow field and away from the normal direction after entering the optical dome. The imaging deviations produced by the aero-optical flow field and the optical dome, respectively, are superimposed effects. Under the same flight conditions, the imaging deviation caused by the aero-optical flow field is smaller than that caused by the optical dome.