A method is presented for echo modeling of real beam scanning radar. Aiming at application requirement of two-dimensional high resolution imaging in the forward area of radar platform, a technical approach is put forward by using real beam scanning radar platform. The basic idea is to convert the azimuth echo data to the convolution form of main lobe antenna beam sampling sequence and the target reflectivity sampling sequence along the imaging sector orientation, according to radar beam scanning time for imaging sector. Finally, the effectiveness of the modeling method is verified by simulation results.