Abstract: The coupling model of three-phase of gas-water-solid for coal seams was established on the basis of the orthotropic physical properties of coal cleats and different seepage characteristics in the orientation of the face and butt cleats.The comparison between the calculated results based on the coupling model and the uncoupling model indicated their good agreement, which verified the accuracy and rationality of the model. By using the coupling model, the distribution of pressure and desorption radius were obtained and the effect of physical parameters of coal cleats on pressure was analyzed. The results showed that the desorption area of the non-coupling model was larger than that of the coupling model. The desorption radius along the face cleats direction increases with permeability orthotropic coefficient increasing, whereas it decreases along the butt cleats direction. The pressure along the face cleats direction increases first and then decreases with permeability orthotropic coefficient and cleat width increasing, and increases with permeability orthotropic coefficient, cleat density and cleat width increasing.