Abstract: Aiming at the analysis of the radar scattering characteristics of electrically large complex targets, the shooting and bouncing rays (SBR) method, which is accelerated by GPU and combined with the BVH tree structure, is used to calculate the angular distribution characteristics of the radar scattering cross-section of a complex target, the angular distribution characteristics of the radar scattering cross section. The GPU-accelerated SBR is implemented using C++AMP, which accelerates the ray tracing part and improves the ray tracing efficiency of the SBR. The ray intersection rate is accelerated using the BVH tree structure, and the SAH division method is introduced to divide the face elements in the scene to avoid the overlapping of the enclosing boxes, which improves the accuracy and efficiency of the BVH tree construction.By comparing with the method of moments (MoM) and ray-tracing method (RL-GO) in the commercial electromagnetic software FEKO, it is demonstrated that the presented GPU-accelerated SBR show good validity and reliability, which also shows advantages in computational time and memory consumption. The angular distribution characteristics of radar scattering cross sections of complex aircraft targets with and without missiles are analyzed and discussed, and the numerical results indicate that the GPU-accelerated SBR in this paper is able to deal with the radar scattering characteristics of electrically large complex targets, and it is more effective and efficient than the traditional ray tracing method.