Abstract: A water quality governing equation including sediment pollutions is derived based on the 3D advection-dispersion equation in shallow lakes.Coupled with the shallow water flow governing equations, a plane depth averaged 2D flow-water quality-sediment pollution coupled model is developed.A finite element formulation is established by using the method of Galerkin weighted residuals.A 2D real-time model for flow-water quality is developed.The simulated the dynamic hydrologic and water quality process changes with time by using the developed model.The simulated results match the measured data well, which are proved reasonable.The study provides a new approach and a practical tool for admixture flow and water quality simulation with the sediment pollutions in the shallow lake.