With P band polarization data arising, penetration ability of the data is increased.It's truthfulness that premise assume of three-stage inversion method based on random volume over ground (RVoG) model. In this paper, author proposed a new a new algorithm based on the GVB model, which using the 3D retrieval of stand height, back scattering center height and standard deviation. The algorithm was verified by simulation data and E-SAR airbornepolarizationdata respectively. The results show that the improved algorithm increase the number of estimated pixels by 19.7% and the accuracy of stand ...