This paper defines the intersection angle between the tangent plane at the boundary of aero-optical flow field and the body axis as the boundary angle and focuses on the influence of the boundary angle on the imaging deviation. This paper shows that the boundary angle of the aero-optical flow field is different at different flight conditions, which means the location of the zero value of imaging deviation is different. With the increase of the line of sight angle, the imaging deviation decreases first and then increases in the opposite direction. After the change of flight conditions, the boundary angle decreases with the increase of the compression of the flow field. The imaging deviation increases if the incident light is on the right side of the normal and decreases in the opposite direction.