Using the measured hydrological and sediment data in the summer Funing Bay, the variation characteristics of suspended sediment concentrations are analyzed, the transport mechanism of suspended sediment studied, and the controlling factors of suspended sediment transportation discussed in this paper. The results show that the suspended sediment concentration decreases from the inside to the outside of the bay in plane view. Vertically, the average sediment concentration of each station decreases from the bottom layer to the surface layer. Suspended sediment is transported landward within the bay, and moves southwestward in the mouth and outside the bay, and advection transport dominates the transport of suspended sediment. Under normal weather, the net transport direction of suspended sediment in the study area in summer is basically consistent with the residual flow direction. Under the southwest strong wind weather, however, the concentration of suspended sediment in the study area increases, and the transport direction turns to northeast. The Min-Zhe coastal current is weak in summer and has little effect on the transportation of suspended sediment in the study area.