For CP-GTD model,a novel method for two-dimensional full polarization scattering center parameter estimation based on the group sparse representation is proposed by using the group sparse characteristic of full polarization radar echo.In the proposed method,the parameter estimation of full polarization scattering centers is converted to the issue of group sparse signal reconstruction,and the adaptive grid refinement is used to divide the grid.Finally,coherent polarization scattering matrices are modified via the least square method.Compared with the method based on the combined spectral estimation,the proposed method does not need the quantity of scattering centers,which can avoid performance deterioration caused by incorrect scattering center quantity estimation,and can have a wider scope of application.The simulation experiments also show that the proposed method has a better robustness,and it is proved to be effective in full polarization scattering center extraction of target.