Abstract: In order to meet the needs of radar target detection, recognition and classification above the soil surface, the spatial domain synthesis method is used to generate the soil surface with high undulation that obey the Alpha-stable distribution, the Topp model is selected to simulate the dielectric constant of the soil, and the method of moments is used to study the composite electro-magnetic scattering from the moving triangular cross-section column above the soil surface under the condition of cone wave incidence, the variation curve of the composite scattering coefficient with the scattering angle is obtained by numerical calculation, the influence of horizontal translation, vertical translation, rotation and the incidence angle of electromagnetic wave of equilateral triangle and irregular triangular columns on the composite scattering coefficients is analyzed. The numerical results show that the horizontal translation and rotation of the equilateral triangular cross-section cylinder have a great influence on the composite scattering coefficient, while the vertical translation has a very small influence on the composite scattering coefficient; the vertical and horizontal translation of irregular triangular cross-section columns have little influence on the composite scattering coefficient, while the rotation has great influence on the composite scattering coefficient. The results can provide theoretical basis and practical methods for engineering problems in civil and military fields.