Abstract: The rough surface of snow and soil is simulated using a rough surface of exponential type. The transmission characteristics of electromagnetic wave through the soil surface covered by snow is investigated using the hybrid method based on the Method of Moment (MoM) and the Kirchhoff Approximation (KA). The snow surface and the soil surface are divided into an MoM region and a KA region by the hybrid method. The angular distribution of the transmission coefficient is obtained by the numerical calculation. The influences of the root-mean-square height of the snow surface and the soil surface, the type of the snow layer, the soil moisture, the thickness of the snow layer on the transmission coefficient are analyzed. It is indicated that the root-mean-square height of the snow surface, the type of the snow layer and the soil moisture have a considerable influence on the transmission coefficient,, but the influence of the root-mean-square height of the soil surface and the thickness of the snow layer can be neglected.