Active MMW seeker can locate and track the target by emitting high-frequency pulse, and possess satisfying adaptability to suddenly cut-off radar while conical scanning is one of the effective seeker-steering systems. This paper aims to distill from the echo of the target location-related angles via Flourier Transformation, for these angles can be used to revise the attitude and course of the seeker timely, so that the target is kept in sight commendably. Numerical simulations were carried out to verify the satisfying performance of the proposed method.