A novel modified physical optics algorithm is proposed to overcome the difficulties of near field scattering prediction for classical physical optics.The method is applied to calculating the near field radar cross section of electrically large objects by taking into account the influence of the distinct wave propagation vector,the near field Green function,and the antenna radiation patte.By setting up local reference coordinates,each partitioned facet has its own distinct wave front curvature.The radiation gain for every surface element is taken into consideration based on the modulation of the antenna radiation patte.The Green function is refined both in amplitude and phase terms and allows for near field calculation.The scattered characteristics of the near field targets are studied by numerical simulations.The results show that the approach can achieve a satisfactory accuracy.