Abstract: The slope and particle zoning of the tailings pond beach affect the safety of flood control and the stability of the dam body. In order to accurately quantify the sedimentary characteristics of tailings particles on the beach, a calculation method based on the FLOW-3D sediment alluvial theory is proposed for coarse-grained sandy tailings. The calculation method of the free settlement of tailings slurry and the experimental verification show that the calculation method has good reliability and the calculation accuracy meets the engineering requirements. The flow trough calculation system is set to simulate the operation of the beach surface, and the sedimentation and sorting characteristics of the beach surface under different inflow concentrations are calculated. The calculation shows that the geometric shape and particle deposition characteristics of the dry beach surface of the tailings pond are closely related to the particle size composition and slurry concentration. Specifically, large concentration of tailings and steep beach slope tends to incur more complex morphology. Shorter particle deposition distance renders smaller partition range of coarse particles.