The Monte-Carlo method is applied to construct composite rough surface model for describing ground and near sea in adjacent region. The Gauss spectral function is introduced to simulate actual ground surface. Based on the shallow coefficient, the joint North Sea wave project (JONSWAP) spectral function is used to simulate actual near sea surface. A new shaping method based on fractal theory is proposed. Different weighted inverse tangent functions are introduced to realize diverse actual environments, such as ground and near sea in adjacent region with linear boundary, crescent boundary, valley boundary and fractal boundary. The composite electromagnetic scattering from double targets above ground and near sea in adjacent region is investigated by using the hybrid methodthe method of moment with the Kirchhoff approximation. The curves of composite scattering coefficient of double targets above two kinds of traditional environment and the composite environment are compared. The composite scattering coefficient which varies with incident angle, the parameters of ground region and near sea region, the shape of boundary, and the parameters and category of double targets is studied in detail. The high efficiency and high precision of the hybrid method are verified. The numerical results show the composite scattering characteristics of double targets above ground and near sea in adjacent region, which can be a reference for target detection, remote sensing and imaging in this kind of composite environment.