Some studies of composite electromagnetic scattering from targets and rough sur- face are implemented by using the Propagation-Inside-Layer-Expansion (PILE) combined with the Forward-Backward Method (FBM) hybrid scheme. Multiply targets and rough surface case is considered. The composite scattering integral equations are bulit. The formation mecha- nisms of the EPILE+FBM scheme including the self- and multal coupling inductions between targets and rough surface are analyzed. The accuracy and efficiency of the hybrid algorithm are verified. The applications of this scheme for the specific type of targets are carried out. The scattering results under different parameters, such as different target size, different roughness, etc., are investigated. The important scattering phenomena and characteristics are discussed and corresponding conclusions are obtained. The presented hybrid scheme will make sense to the domains of electromagnetics, remote sensing, radar surveillance, target recognition, optics, material science, etc..