Abstract: The effects of airfoil geometric parameters on wing's spacial and polarized scattering characteristics have been systematically revealed.The results of the study indicated that the calculating value of diffraction from trailing edge by using the formula of the straight wedge is very far from experimental results for vertical polarization,and the contribution of thickness of the trailing edge to scattering must be considered in the calculation.The scattering peak of leading edge depends only on radius of airfoil for horizontal polarization.But for vertical polarization,it depends on maximum thickness and the location of maximum thickness.Engineering formulas for evaluating all scattering peaks were given in the paper.It is important for the design of low RCS wing.