An aerodynamic conformal dome calls for bullet shaped aspherical surfaces. The aspherical domes with gimbaled missile seeker have a large amount of dynamic aberrations varying with gimbal angle because of the non-rotationally symmetric character in non-zero field of regard. A fixed corrector is used to correct aberrations introduced by the ellipsoidal dome with fineness ratio 1.0 in our demonstrating conformal optical system. In this system, we use the gimbaled dome instead of the gimbaled inner optical system to simulate non-zero field of regard. The designed modulation transfer function of the simplified conformal seeker is higher than 0.5 and the encircled energy in one pixel is higher than 80% in all field of regard. The measuring result shows that the modulation transfer functions at 17 lp/mm are higher than 0.45 in small fields and higher than 0.25 in large field of regard.