Abstract: High resolution target recognition technology can effectively obtain complex target information. This paper presents a forward approach for establishing complex radar target parameters scattering center model based on geometric CAD model. The method is completely out of SAR images, closely related to the geometric and physical properties of the target. A forward approach for modeling of complex target scattering center is developed to determine the scattering type, position and length. The design of the software of scattering center parameter management software is completed based on the VS2010 platform. The forward modeling method of complex target scattering center, starting from the target geometric features, decomposes the target components by ray tracing method and diversifies the paths of the rays, so that the scattering contributions of different components can be distinguished to accurately reflect the complex targets. The examples and analysis of this paper illustrate the rationality of forward modeling of complex target scattering centers.