This paper presents a 2D tidal current and suspended sediment model which takes the Yongjiang River and the out sea area as the key research area.The model is adopted to carry out numerical simulation of tidal current and suspended sediment movement of half a month in the concerned area in June 2015.A good agreement is found between the observation data and computed results.Analysis on the computed residual current and sediment transport pattern in the flood season shows that the residual current generally causes transport from northwest to southeast in the out sea area,and seaward transport in the river.The sediment transport pattern is almost in accordance with the residual current pattern except local regions at the estuary.The sediment is transported into the Yongjiang River by the flood current and the net sediment transport direction near the estuary is towards the upstream.The local difference between the residual current and sediment transport patterns at the Yongjiang Estuary is because of the time lag between the tidal current and suspended sediment movement.