Abstract: The precession parameters estimation of space target is of great significance in attitude estimation, the prediction of landing point of reentries and target recognition, etc. For the precession space target with stable scattering centers, this paper proposes a new precession parameters estimation method based on the wideband radar observations, which is free of the prior information of the target shape. Firstly, the kinematic model of the precession target is elaborately derived. Secondly, by using the association results of the histories of the 1D high resolution range measurements of the multiple stable scattering centers, the 3D motion matrix and 3D image are obtained. Thirdly, based on the 3D Euclidean reconstruction, the precession parameters are estimated by alternating between the sequential quadratic programming optimization and nonlinear least square algorithm. Finally, the experiments on the electromagnetic analysis data verify the effectiveness of the proposed method.