In order to recognise the ballistic target by effectively utilizing the scattering centers of the target, a dechirping method is proposed. First, by proceeding planar FFT, the imaging for target's scattering center is achieved, and then target's feature information is extracted from its ISAR imaging. Finally, a new matching recognition method is proposed to realize target's classification. The method is used for judging target's classification by extracting the information from the scattering centers' position and amplitude through constructing matching matrixs and again comparing with the preinstall threshold. The simulations and the assessments of classified performance show that the method is efficient in target's recognition under the set conditions.