Abstract: Most artificial targets is anisotropic. Over large azimuth angular extents the energy reflected by anisotropic targets is not uniform. This feature is helpful to distinguish different kinds of targets. Data inversion method based on Circular-SAR is proposed to extract this feature for Circular-SAR can obtain 360°observation of targets. Thus three features are defined, which are the persistence angle, peak value and scattering direction. These features can be apply in artificial targets recognition and adaptive imaging. The method and its application is validated by airborne data.