Abstract: The imaging method of the mid-course missile is one of the key techniques of the missile defense system. Cause of the special precession character of the ballistic missile warhead, the small rotation angle assumption is not satisfied, which leads to blurring of the image obtained by Range Doppler (RD) algorithm. To solve this problem, a novel wideband imaging method for precession targets with rotational symmetry is proposed in this paper. Using Back Projection Transform (BPT), the echoes of the target in the range-time domain are transformed to reconstruct the scattering centers position in the para meter domain by means of coherent accumulation. The algorithm is verified by the experiment results of the anechoic chamber data, which demonstrates that the algorithm is more efficient than the Generalized Radon Transform (GRT) method.