Abstract: After analyzing the drawbacks of maximum-likelihood method in estimating Geometrical Theory of Diffraction(GTD)scattering model parameters,an integrative estimation flow based on parameters decoupled is provided in this paper.Firstly,the range parameter of scattering centers is obtained by matrix-pencil method,and the type parameter of scattering centers is estimated based on approximation of GTD scattering model,and then the amplitude parameter of scattering centers can be estimated by least-squares method.The experimental result shows the validity of the algorithm.