To correctly and accurately inverse parameters of the model in study on pBRDF(Bidirectional Reflectance Distribution Function),we studied the parameters of pBRDF model and their effects on the scattering characteristics of rough surfaces by theoretical analysis and simulation.A new method making use of the relationship between relative polarization and angles based on P-G(Preist-Germer)model was proposed,and a parameter inversion algorithm was developed,following a review of existing parameter inversion met...